"Andrew Huberman"

9 Feb 2026 · 1 h 10 min · 29 chapters

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In short

Andrew Huberman discusses evidence-based ways to recover from illness and optimize brain/body function, focusing on hot vs cold exposure, nicotine and sleep/REM, and circadian light hygiene. He also covers supplements (NAC, NAD pathway compounds, metformin) and practical sleep strategies for early-morning awakenings.

Guest backgrounds

Andrew Huberman is a Stanford School of Medicine tenured professor in neurobiology/ophthalmology (by courtesy psychiatry and behavioral sciences) with a PhD in neuroscience. He hosts a highly downloaded science podcast.

Key claims

  1. For flu/early sickness: hot baths/hot showers can mobilize immune responses; cold plunges are a potent stressor and may be counterproductive when you’re already getting sick.
  2. Nicotine is not carcinogenic, but raises blood pressure/vasoconstriction and is highly habit-forming; vaping/smoking are harmful.
  3. Nicotine (non-smoking delivery) may modestly affect REM via acetylcholine receptors; sleep can be improved by light timing (bright mornings, dim nights).
  4. NAC (600–900 mg, 2–3x/day) has peer-reviewed evidence for reducing flu infection risk.
  5. NAD-pathway supplements (NR/NMN/nicotinamide) may reduce inflammation and improve energy (no direct lifespan extension evidence stated).

Notable examples

Scandinavians/Russia bundling babies outdoors in cold mornings; a UK study (~80,000 subjects) linking brighter days/dimmer nights to mental health benefits; Sean’s vivid REM dream; Huberman’s colleague Mike Eisenberg recommending low-dose tadalafil (2.5–5 mg) for blood pressure/capillary dilation (prescription required).

Written by AI. May contain mistakes. Listen to the episode to check what was said.

Chapters

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Post-Holiday Reflections

0:00 to 0:22

The hosts discuss their experiences during the holidays and returning to work.

“Mazda has been named Consumer Reports' safest new car brand.”

Post-Holiday Reflections

2:35 to 5:42

The hosts discuss their experiences during the holidays and returning to work.

“But you're still, you've got it in the lungs?”

Email Management Habits

5:42 to 6:40

The hosts share their approaches to managing email and productivity.

“I'm really nervous about today's episode, you guys.”

Health Tips for Winter

6:40 to 10:00

Andrew Huberman discusses health strategies for overcoming winter illnesses.

“Because if I don't, I know, we talk about this a million times.”

Cold vs. Heat for Health

10:00 to 14:00

The conversation shifts to the benefits of heat and cold exposure on health.

“It turns out that the old practice of hot baths is actually quite good.”

Impact of Heat and Cold on Health

14:00 to 15:14

Explore the effects of heat and cold exposure on health, particularly regarding sauna and sperm health.

“Your adrenaline spikes when you get in the cold, which is part of the reason you do it.”

Nicotine Usage and Misconceptions

15:14 to 16:14

Discuss the misconceptions and effects of nicotine, including its unique stimulating properties.

“Wait, you're saying that the sauna will cut your sperm count?”

N-Acetylcysteine: Health Benefits

16:14 to 18:25

Learn about N-acetylcysteine (NAC) and its potential to prevent flu infections and enhance recovery.

“And they either got NAC two or three times a day at about 600 to 900 milligrams per day or not.”

The Dual Nature of Nicotine

18:25 to 23:16

Understand nicotine's stimulating and relaxing effects, alongside its habit-forming properties.

“so it's going to help you drain out more as well.”

Cannabis Use and Its Effects

27:35 to 28:00

Discuss the impact of cannabis on mood and behavior, particularly in habitual users.

“I've always said that there's nobody grumpier than a stoner who's not stoned.”
Show all 29 chapters

Exploring Cannabis and Its Effects

28:00 to 30:00

Discussion on the effects of cannabis, particularly on mood and psychosis.

“You know, but does that make me, I don't know.”

Understanding REM Sleep

30:00 to 31:20

Exploration of REM sleep, its importance, and factors influencing it.

“I took so much and I was like rocking and I'm like, Scotty, Scotty.”

Sleep Temperature and Health Tips

31:20 to 35:40

Tips on adjusting sleep environment for better REM sleep and overall health.

“and I'm kind of remembering a bit of my dreams, does that mean I'm getting REM?”

Supplements for Longevity

35:40 to 38:20

Discussion on supplements like metformin and nicotinamide for health.

“Now listen, every single day, I know you talk about supplements too.”

Sleep Patterns and Strategies

38:20 to 42:00

Insights into sleep patterns, including tips for better sleep habits.

“However, it does seem to increase energy and NR in particular, what you're taking, there's some good human studies that it can reduce inflammation in the body.”

The Importance of Sleep Timing and Environment

42:00 to 45:04

Learn how sleep timing and environmental factors affect sleep quality.

“Meaning getting into bed around 9, 9.30, falling asleep at 10.”

Andrew Huberman's Journey into Science

45:04 to 49:18

Discover Andrew Huberman's background and his passion for biology and research.

“I don't understand how people can sleep with blacked-out curtains.”

The Role of Science in Everyday Life

49:18 to 51:44

Understand the significance of science and medicine in daily living and personal health.

“that I think people can make use of and telling them.”

Navigating Misinformation in Wellness Trends

54:30 to 56:00

Explore the challenges of differentiating valid health information from trends.

“and there's so many people out there now professing.”

Understanding Cortisol's Role in Daily Life

56:00 to 57:20

Learn how cortisol levels influence your daily energy and health.

“People are deeply rational at some level until they're not, right?”

The Science and Impact of GLP-1s

57:20 to 59:20

Discover the revolutionary effects of GLP-1 medications on health.

“Now, when it comes to things like vaccines and prescription medication, let's take a slightly less barbed wire version of this, but that's very timely, which is all this stuff about the GLP-1s, right?”

Addressing Conspiracy Theories in Health

59:20 to 1:01:20

Explore the societal divide over health beliefs and conspiracy theories.

“I like to think, Will, I don't know, you tell me.”

Living Longer and Healthier

1:01:20 to 1:02:20

Find out how lifestyle choices can enhance longevity and health.

“Los Angeles is the place where this stuff got blended together.”

Preventing Alzheimer's and Managing Health

1:02:20 to 1:10:01

Understand measures that may help prevent Alzheimer's and improve well-being.

“And the best part is in front of his kids and grandkids.”

The Impact of Technology on Social Interaction

1:10:01 to 1:13:06

Explore how technology affects our social interactions and mental well-being.

“and forgive me, I like to fire hose this stuff.”

Reflection on the Podcast Experience

1:13:07 to 1:14:11

Discuss the enriching effects of long-form content and the challenges of misinformation.

“What you guys, I know everyone's always jocking you guys, but here's the deal.”

The Importance of Credible Information

1:14:12 to 1:16:13

Understand the significance of sourcing credible information in the digital age.

“you could just go there and start asking a bunch of questions.”

The Importance of Credible Information

1:16:14 to 1:16:46

Understand the significance of sourcing credible information in the digital age.

“Smartless is 100 % organic and artisanally handcrafted by Michael Grant Terry, Rob Armjarf, and Bennett Barbaco.”

The Importance of Credible Information

1:16:51 to 1:17:47

Understand the significance of sourcing credible information in the digital age.

“the series stars five-time Academy Award nominee Ethan Hawke as Lee Raybon, a self-described Tulsa truth-storian whose fixation on the truth tends to create more problems than it solves.”
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Transcript

Automatic transcript. May contain errors.

0:02Andrew Huberman:Mazda has been named Consumer Reports' safest new car brand. It starts with our approach. Every Mazda comes standard with proactive safety features.

0:11Will Arnett:So you're more aware of what's around you, more focused on the road ahead, and ready before problems ever start. Mazda.

0:20Andrew Huberman:More of what matters most to you. Go to mazdausa.com to learn more. Consumer Reports does not endorse or promote any product. Ever invest in something that seemed incredible at first, but didn't live up to the hype? Yeah, I wasted a lot of money buying a car when I was 21 years old. I spent way too much on it. It just never worked, and I didn't know what I was doing. Marketers know that feeling. They optimize for the numbers that look great like impressions, but they don't see revenue. LinkedIn has a word for that, bowl spend. Instead, you can get the highest ROAS of major ad networks with LinkedIn ads.

1:00Cut the bull spend. Advertise on LinkedIn. Spend$250 and get a$250 credit. Go to linkedin.com slash smartless. Terms apply.

1:13This episode of Smartless is sponsored by Ashley, the brand that just helped us turn a live event stage into a fully styled living space. Ashley is all about helping you create a home that reflects who you are with styles that balance timeless design and modern trends. And pieces built to handle everyday life with durable materials and easy-to-maintain fabrics. For our live show, we were sitting on their modular ModMax sofa setup that you can configure to however works best for your space. Plus, we had oversized accent chairs and coffee and accent tables that really tied everything together. Let me tell you about the ModMax sofa.

1:50We used it for our live show. It was so comfortable. I felt like I was sitting on a cloud. The worst part about it? Getting out of it. Ashley is all about style that's made for real life with white glove delivery right to your room of choice. Visit your local Ashley store or head to ashley.com to find your style.

2:12Sean Hayes:Hey. Hey, Sean. I do want to get into this. I know we got to do a cold open for the show, but I'm flying in New York today. Why are you going? Why are you coming out here? Why are you coming out here? I got to go take care of some stuff. and I just don't, I mean, I'm not trying to be vague about it, but no, I just got to do some stuff. I got to go to New York. I got to go. I got to come evict you from your apartment. Okay? Are you happy? Welcome to Smartless. Smart. Less.

2:40Smart. Less.

2:46Smart.

2:48Will Arnett:Less.

2:52Will Arnett:Jason, you're still coughing. I'm still coughing. I'm still clearing. You guys both got it, right? Yeah, I'm doing a little better. But you're still, you've got it in the lungs? No, I don't.

3:07Sean Hayes:Everybody's working for the weekend. See, I have enough energy to do that. I know I can get Sean. I knew I could live. Everybody's working for the weekend. Hey, band right now, JB, who sang that? You want a piece of my heart? Yeah, that's not. He had a headband.

3:30Will Arnett:Tiger Bomb. Fucking close. White Tiger. Tiger Bomb. Sort of. Tiger's Milk. No, Tiger's Milk? No. Wasn't it Loverboy?

3:43Sean Hayes:Yes, Loverboy.

3:44Will Arnett:That's what I said. That's weird.

3:47Sean Hayes:By the way, by the way, honestly, and I don't want to get too philosophical because it's the new year and stuff like that, but there is something to it. Everybody is working for the week. God. You know? I'll tell you what.

4:00Will Arnett:We just went through the holidays here, listener. You sure did. And every day seemed like a Saturday, and I was really excited about that. I loved it, but I feel like my brain got real labby. Like, now I'm, like, afraid to go out. outside. I feel like I'll have culture shock if I like run into somebody that's like a serious person.

4:25Sean Hayes:Somebody, last night I was talking to, JB, you and I were texting a little bit during the last weekend of football. We're dating this when we're recording this, but we're talking about football and stuff. And I was talking to our old buddy, Eli. Is that right? Oh, I do miss Eli. Sweet Eli. And he was saying, the holidays are over. Like tonight's the last night. Like it was the last football game of the regular season. It was the last weekend after the thing. And the year starts. And honestly, I got to say, I'm really happy about that. We were all sick over the holiday from starting Christmas Day.

4:59Sean Hayes:Had the thing, JB, that you've had. Sean, which you now have. I think Jason gave it to me, yeah.

5:05Will Arnett:Yeah, that big Thanksgiving tri-kiss that we labeled it, right? Just as we were leaning in, we said, let's call this a tri-kiss. And then you guys got it. A turducket. It was a turducket kiss.

5:19Sean Hayes:So I'm just, I'm like, at this point after we spent, which was nice. Again, we felt very fortunate we got to be at home with the family, with all my kids, and we had sort of 10 days kind of sequestered on the East Coast. But I'm looking forward to emerging from this. Yeah, a little bit from this. Yeah. I know what you mean. And here we are.

5:40Will Arnett:We're starting right back. We're at work now. 9.30, Monday morning. We're a little out of practice, right? I know. I'm really nervous about today's episode, you guys. I know.

5:48Sean Hayes:Nobody's done, and we haven't covered the weather or the traffic yet. I think there's a sig alert on the 210. How do you stretch out for a podcast? I don't know. Jason, you're going to arrive in about 10 more minutes. I can tell. Jason's got his, he's wearing a hoodie, and he's got the hoodie up, and he's got his headphones on the outside of his hoodie.

6:10Will Arnett:I'm still trying to stay cozy, like I'm making fires still. Wait, yeah, tell me, but what do you mean, Jay, when you said that? Because I think the same thing when I, I was thinking about you, about like, you were like, I love being cozy and watching movies and not going anywhere. I'm kind of the same way. And then I know what you mean. Like, oh, shoot, this has to end and like the world starts again.

6:30Sean Hayes:Sean, you're really on the fence between the, well, I got a couple things. A, there's that. Because you say you like to cozy and do nothing. But the truth is, you also like to just rifle things off a checklist. Absolutely. So you never stop. That's right. Three in the morning. I don't want to think about it. Because if I don't, I know, we talk about this a million times. If I don't check it off or respond or something, then it lingers in my head. I'm like, I got to do that. And I just don't want to think about it. I know. So there's that.

6:55Will Arnett:What's your email inbox look like? Is it clean or is it cluttered? Always zero. If it's not zero, I panic. Me too. Empty. Except for the only things that are in there means I need to.

7:04Sean Hayes:All the emails are in there, but there's just no new messages.

7:07Will Arnett:Yeah, I need, if it's still in my inbox, I need to respond to it. That's right.

7:11Sean Hayes:That's how I feel. But you don't delete all the emails you got.

7:14Will Arnett:No, but they've been read. But that's when, I'm amazed when I see people, I'm amazed when I see somebody's phone and the messages of the emails are like 2 ,360. That's a sign of, that's a sign of. I don't know how to sync my accounts yet. No, no, no, no, no. Come on. No, no, no, no.

7:30Sean Hayes:You need to go and get an assessment if that's happening. Or an assistant. A deep, not an assistant. Or that. That sort of betrays a deeper, like you need a lot of assistance at this point. And we're going to send somebody over to the house. The other thing is, JB, I want to know. Yeah. Over the holiday, how much wood did you go through? Kind of wood, Chuck Chuck? And Sean, that question is going to go for you, but it's going to be on a different subject. Go ahead.

7:57Sean Hayes:JB, how much wood did you get through?

8:00Will Arnett:Consistent with Sean's answer, I think I went through two loads. Wow.

8:07Sean Hayes:Very nice. Way to land that. What did I say? I said you'd show up in about 10 minutes, and it only took like four. He's back. He is back, you guys. 2026, look out. All right. Well, speaking of brain mushiness, this is perfect. My guest today is a fellow podcaster, but that's about where the overlap ends. He's got a PhD. You can't even make your own writing sound natural. It's terrible. You wrote it and it makes it sound like it's red. It's terrible. Oh, I'll read the whole thing right in front of you. He's got a PhD in neuroscience. He's a tenured professor at Stanford School of Medicine in neurobiology and ophthalmology and by courtesy, psychiatry and behavioral sciences.

8:53His work's been featured in Time, BBC, Scientific American, basically every publication that makes me feel dumb. His podcast is one of the most downloaded in the world. It's the cold plunging, dopamine optimizing, sun staring, science genius, Andrew Huberman. Great. Finally.

9:09Will Arnett:Good morning and happy new year. Good morning. Happy new year. How are you? Doing great. Yeah. How's your brain fog today? Are you flabby from the holiday?

9:21Andrew Huberman:I spent this holiday, like I've spent so many holidays, working. In the past, it used to be grants and now it was doing book edits. But I'm very familiar with this, what you called flabby brain thing that happens after about four days away from, I don't know if it's the grind or the work, but it's a normal thing and you snap right back.

9:42Will Arnett:Yeah.

9:43Andrew Huberman:Yeah. Being sick doesn't help. I took some notes here as I was sitting there in the backdrop. This thing that's been going around is rough. A couple of, I'll just say there are a couple of things that are supported by the peer-reviewed literature that can really help accelerate moving through something like what you all went with. I had it too a couple of months ago. Three things. It turns out that the old practice of hot baths is actually quite good. You don't want to make it scalding, obviously, but you get into a just tolerably hot bath. I'm writing this down. And it turns out it mobilizes some features of the immune system in ways that can help you get over your sickness.

10:23Andrew Huberman:Like just because you sweat it out? Is that what it, I mean.

Read the full transcript

10:26Sean Hayes:No, dummy. Just let him finish.

10:28Andrew Huberman:You're activating some of the mobilization of some of the cells that go and scavenge for whatever it is that you're dealing with. This is particularly useful at the beginning. Your immune system has two different phases. There's a kind of an innate phase where it's like any foreign invader gets kind of the same inflammation response. that's good. That's the kind of like, oh, you know, I'm feeling a little like under, I'm a little extra tired. That's the time, ideally in the hour or two before bed, you take a nice hot bath or hot shower and then just get into bed. And, you know, if you do that for a couple of days in a row, you may be able to fend it off.

11:02Andrew Huberman:If not, once you have it, keeping that practice up, provided you don't have a really high fever is, is really useful. That, and you know, I know, I know I'm always talking about the morning sunlight thing. Please say smoking cigarettes. I'm going to set your circadian row. No, but we can talk about nicotine if you want. A lot to say about nicotine. But getting some what we call long wavelength light, so some sunlight, or I'm not here to say red light therapy, but getting some sunlight, this is very well supported by the literature because, again, it's helpful for your mitochondrial function, for your immune system.

11:36Andrew Huberman:In Arctic countries, not so much Arctic, but in Scandinavia, in Russia, they actually put babies bundled up out in the cold in the morning. Oh, sure. To mobilize these things.

11:44Sean Hayes:Yeah, we throw them outside.

11:46Andrew Huberman:Here we don't do that. Here that'll get you child protection services. No, but up in Canada. Oh, it'll be fine. We'll toss her outside for sure. And there are a couple other things we can talk about, but in any case.

11:57Sean Hayes:Wait a second. Now, listen, Andrew, nice to meet you, first of all. Yeah, it's so great you're here. I've waited you on for so long. Okay, shut up. Can I call you Huberman? You can call me whatever you want. Okay. How about Doc? Because I refer to you as Huberman as if I know you all the time because I've seen clips of yours online for years and stuff. And so I like a lot of the stuff you talk about. First of all, you lost Jason when you said bath because he's thinking about his own juices. He hates marinating in juices. I don't understand the concept of it. A lot of men don't like baths.

12:28Andrew Huberman:I hate it. A lot of men like baths. A lot of men don't. It's just the math is wrong. Sauna would be fine. Sauna would be fine.

12:34Sean Hayes:Okay. So sauna. So interestingly enough, and by the way, not that interesting. When I was starting to get this flu, I looked it up. I consulted. I did my own research, as they say, meaning I have Google. A lot of people like to talk about research, and what they mean is that they use the internet. Right. Like a bunch of fucking dummies. And it told me, because I've been a proponent of sauna and cold. And cold plunges, always. For more than 10 years. Early days. and they said to me, the internet, they said, don't expose myself if I have the flu that they were worried about because they said that your body's already working hard enough.

13:20Sean Hayes:Historically. They were saying don't do the cold plunge or don't do the hot. Don't do either because they were saying because I'd have to fight hard enough. So this was the first time when I was sick that I did not use the heat and or the cold to try to combat it. and it ended up being harsher. And now that I'm hearing you, I'm like, I wish I had because historically I've always just gone in and I saw in early days when I start to feel that thing in my throat or whatever. And usually I'm able to stave it off. So you're saying. Yeah, you know, the deliberate cold exposure, right?

13:52Andrew Huberman:Cold showers, cold plunges, this kind of thing. It is a stressor, counter to what you hear out there. It does not raise cortisol, but it is a stressor. Your adrenaline spikes when you get in the cold, which is part of the reason you do it. And then when you get out, you get that long tail of dopamine and adrenaline that makes you feel much better and more alert, et cetera. That's fine under healthy conditions. I would say if you're battling something or you feel like you're coming down with something, use heat, sauna, hot shower, hot bath, whatever it is that works for you. But I would drop the cold as you're getting into something because it's a very potent stressor.

14:28Andrew Huberman:The thing about heat is if it's too hot, it can also be a stressor. I mean, when you're healthy, using the sauna as a way to get your heart rate up and kind of push it in there a little bit is good. By the way, useful tip, if you put a towel over your head or, you know, you'll notice that Russian banyas, they wear those little hats.

14:44Sean Hayes:I have a sauna hat.

14:46Andrew Huberman:Yeah, it insulates your brain from the heat so you can stay in longer. The impulse to get out is a brain thing, not unless it's very, very hot, a burn thing. And then, of course, if men want to conceive children in the next 90 days, because of the 90-day spermatogenesis cycle, if you're going into the sauna, you need to put a cold packet. You're growing outside your shorts, guys. If you don't want children, also don't use this as a surefire way to avoid having children. It's, you know, many accidents.

15:15Sean Hayes:You got to stick your nuts in ice, eh?

15:19Will Arnett:Wait, you're saying that the sauna will cut your sperm count? Absolutely.

15:24Andrew Huberman:Heat and sperm, not a good combo, which is why we're getting to anatomy here, which is why the scrotum can extend and contract closer to the body. It's to maintain the optimal temperature for spermatogenesis. How about that? Yeah. And so if you go in a sauna or a hot bath quite a bit in the 90 days prior to trying to conceive, you're going to limit the number of highly mobile sperm. That said, I'm sure many children have been conceived in saunas and hot baths. and in hot conditions. Hot tubs. But this is on average, right? No comment. No comment. God, I would have had tons of kids by now.

16:01Will Arnett:Now, let's get back to what you were saying, doctor, about please expand on nicotine as one of our co-hosts here chews his Nicorette gum. Sure. Is that... Not Nicorette gum. It's not... Are you looking for freebies?

16:15Sean Hayes:I do a Zin gum combo. Okay, I have a lot to say about this.

16:19Andrew Huberman:Before I do that, just very quickly, there's there first of all i want to put a full disclaimer i have no financial relationship to what i'm about to describe in any way there's a beautiful study published and it's on pubmed i can send you guys the link if you want and i learned about this from an er doc out here in los angeles who needed to keep himself healthy during the winter season n-acetylcysteine also called knack is a glutathione precursor there's a beautiful study showing that when they people signed up for a study where they were deliberately exposed to people who had flu. Okay? And they either got NAC two or three times a day at about 600 to 900 milligrams per day or not.

17:01Sorry, just describe what NAC is because you said that long word. I don't know what that is.

17:04Andrew Huberman:N-acetylcysteine, it's a precursor to something called glutathione, which is used in a bunch of different cellular processes. Normally, I think you don't need this, right? You don't need elevated glutathione. I know it's all the rage now to get glutathione drips and that sort of thing. I don't know what that is. I have a more conventional opinion about all that. But if you feel like you're coming down with something or you're going to be exposed to things, or Jason, you mentioned that you're heading off to New York, you've got work to do, you need to recover more quickly. The data on avoiding getting sick by taking 600 to 900 milligrams of N-acetylcysteine two or three times a day when you're getting sick or trying to avoid getting sick is quite robust.

17:40Andrew Huberman:In fact, there's a huge difference in the number of people all exposed to the same virus, that, flu virus in this case, that did not contract the virus. Some still did. It's in the high 20s. But had they not taken it, the control group was somewhere close to 80%. It's pretty impressive. And obviously check with your doctor, this kind of thing. But that's the one thing, you know, we hear about zinc, echinacea, all this stuff. It's the one thing that the peer-reviewed research actually shows can help stave off flu infection.

18:08Will Arnett:Is there any downside to taking it constantly?

18:11Andrew Huberman:Some people will take a little bit each day. It is a little bit of what's called a mucolytic, so it will make your nose run just a little bit more. It's actually used to treat cystic fibrosis at very high doses, which is a buildup of fluid in the lungs. So it's a well-known mucolytic, so it's going to help you drain out more as well. But no, there's really no downside.

18:28Sean Hayes:He wants to drain out. All he heard was drain out, and he's so excited. If I'm losing water weight, I'm happy.

18:37Andrew Huberman:I have a feeling that's related to our previous discussion. Wait a second, wait a second.

18:41Sean Hayes:Like, we're not going to, an hour is not going to be enough time with you and Sean. We have so many, you will put so many boxes. I'll dream.

18:48Will Arnett:But I want to know if our friend is, I want to know if our friend, yeah, if our friend is safe chewing on the Zin. Because there's been so much, and I want to set it up by saying, there's been so much about nicotine is good for you.

19:00Sean Hayes:People are now saying it's great, all this sort of stuff. And so I want to hear once and for all what your take is on nicotine and the various delivery systems.

19:09Andrew Huberman:Great. Right. Nicotine is a very interesting stimulant. It is a stimulant. Sure. But it's perhaps the only stimulant that also relaxes you at the same time.

19:20Sean Hayes:Thank you, Andrew, for coming on the podcast.

19:25Andrew Huberman:So that's a very unique property, right? It gives you that alert but focused, kind of puts you in the groove that is so alluring to humans, so much so, and I'm going to avoid going into a history about nicotine, but let's just say for hundreds of years, but in particular in the last hundred years, humans have figured out ways to get nicotine into their brain. And we know that smoking, vaping, dipping, and snuffing all cause cancer. And I did put vaping in there. Vaping is perhaps safer than smoking, but still causes lung damage, the contaminants, et cetera. Vaping is bad. I'm just going to say it.

19:58Sean Hayes:I mean, the science isn't back yet on the burning of the metal and all that kind of stuff. And I will say anecdotally when I tried to use one of the vaping products, I'm not going to say which one. It increased my blood pressure. It increased my anxiety tenfold, and I went back off it.

20:15Andrew Huberman:Yeah. I'll take a hard stance. Obviously, smoking, we now know. Still cool. Yeah, no one dips or snuffs, really, or people dip, but they don't. My grandfather used to snuff.

20:24Sean Hayes:He used to put a little bit on his. Yeah, mine too. Yeah, he used to powder.

20:26Andrew Huberman:Something is literally putting tobacco up the nostrils. I can't even imagine. Yeah. Okay. Well, okay, so here's the deal. We went from smoking, dipping, vaping, and snuffing. Then we moved to what they used to call electronic cigarettes, vaping. And then now oral nicotine is the main mode of delivery. Nicotine itself is not carcinogenic. This is very important. It doesn't cause cancer, right? It's a stimulant that relaxes you, as I mentioned. It does raise blood pressure, and it increases vasoconstriction. Vasoconstriction is just a clamping off of the little capillaries and vessels, in particular in the periphery, you know, in the fingers, in other extremities.

21:05and in the brain.

21:07Andrew Huberman:And, you know, strokes and other things like that are cutting off a blood supply to small regions of the brain. So if your blood pressure is already high, not a good idea. If your blood pressure is naturally low and you're doing other things, for instance, sauna, to vasodilate once a day or several times, maybe a few times a week at minimum, or a hot bath if you're traveling or a hot shower, taking some effort, especially before bed, to make sure that your capillaries are dilated, not taking nicotine too late in the day. There is a space where I can now safely say what I'm about to say, which is there is evidence.

21:43Andrew Huberman:Well, let me do this backwards. People with Parkinson's and Alzheimer's, if they take nicotine, don't seem to get better. However, there is decent evidence in animals and humans that nicotine, not delivered by vaping, dipping, smoking, or snuggling, right, can be protective against Parkinson's and Alzheimer's? Because it offset, seems to protect neurons against degeneration, which is the hallmark feature of Parkinson's and Alzheimer's. That said, I'm going to feel very comfortable saying what I just said, but some people are going to say, wait a second, I don't want people starting to take nicotine to avoid getting Parkinson's and Alzheimer's.

22:24Andrew Huberman:The blood pressure effect, the mild anxiety effect for certain people is significant. And here's the biggie, and then I'll just kind of peel back and hear what you guys have to say about this. The biggie is that it is highly, nicotine delivered in any form is highly, highly habit-forming. Do we call it addicting? Addicting is, you know, continued use despite harm to self or others. I call addiction a progressive narrowing of the things that bring you pleasure. By those two definitions, it's hard to call nicotine addicting. And yet I know many people that start with one pack of Zin a day, one gum, one four milligram gum.

23:03Andrew Huberman:Pretty soon it's two, pretty soon it's four, pretty soon it's a canister every three, four days. So if it's not addicting, it's highly habit forming. So that's, you know, those are the, I'll occasionally take a piece of Nicorette. Yeah. Yeah, sure. But I don't do it very often. I won't do it more than once every couple of weeks because I love the potent effect. The problem is - Just to get through the day or something, you mean? No, if I'm doing a particularly long session of writing or a particularly long podcast. But here's the thing. If you take a stimulant of any kind, caffeine, nicotine, any stimulant of any kind regularly, pretty soon you need it just to get to baseline.

23:39Andrew Huberman:Most of us drink—90 % of the adult population of the world drinks caffeine every single day just to feel at their normal levels of alertness. And the reason there's so few studies on caffeine that are really solid is because no one wants to go through the— you'd have to go into caffeine withdrawal for two weeks to be able to study. That's why I don't drink caffeine. You seem to have a lot of energy. I don't think you need caffeine. Whereas I need caffeine. That's not why. Like you seem very alert, like you have an alertness to you.

24:07Sean Hayes:First of all, I just want to say, again, it's not like you started, you were like early on, you're like, I'm not going to drink coffee because I don't want to be my baseline to have to be. No, no, not that. No, that's not why. But I didn't want to drink coffee, you know, in high school and stuff when people were drinking it because I saw what people went through when they're like, don't bother me, I haven't in my coffee. Like, I don't want to be that person that I can't talk to you until I've had caffeine, you know, or I'm angry until I'm not woken up until I have caffeine. So I recognized that and I never wanted to be that person.

24:39So then I never drank coffee. I've had soda, but I don't really drink soda anymore. And so, yeah, that's it.

24:45Andrew Huberman:I mean, that's the reason I avoided cannabis. I don't have anything, you know, I think cannabis has, for some people, it can activate psychosis, high THC. For some people, they seem to be able to take it and not really have too much trouble with it. The people I knew growing up who used a lot of cannabis, when they didn't have access to their cannabis, they were pretty difficult to be with. Oh, really? They were irritable. Yeah. And we will be right back. Summer gatherings are easier when the grill does the heavy lifting and Whole Foods Market has the ingredients to make it all come together. Start with no antibiotics ever, meat or grill-friendly seafood like salmon and halibut.

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27:34And now, back to the show.

27:37Sean Hayes:I've always said that there's nobody grumpier than a stoner who's not stoned. They're always the grumpiest people. And there's a real, you can really draw a pretty firm line there. And we're saying, JB, that people who like to traditionally use cannabis, and when they're not using it, can be prone to being grumpy. Thoughts? wait so take it easy man he just went to go out and grab some nicotine and some cannabis

28:09Will Arnett:you're saying when people who use cannabis they get grumpy when they're not using it yeah

28:14Andrew Huberman:when they don't have access to it like because I was saying Jay I was saying I don't drink caffeine because I don't want to be like a grumpy person until I reach my base you know

28:23Will Arnett:I might be a tough person to gauge on that because I think my set sort of default idol is, I wouldn't say grumpy, but is, you know, I'm the guy that sits at the back of the room and doesn't do a lot of talking, but I'll throw a bomb every once in a while. That's right, and then leaves. You know, but does that make me, I don't know. I got to work on my personality. You don't hit the bill of what I was thinking of.

28:53Andrew Huberman:I was thinking about chronic weed smokers. Yeah, chronic weed smokers. You know, cannabis is definitely here to stay. It's kind of amazing how much the reality is changing. I mean, it's people sold everywhere. There are some real issues. I think the big one that's very overlooked is that everyone talks about, oh, you know, the weed is so much stronger now than it used to be. It's true. THC levels are much higher. But here's the thing. I had a researcher on my show who specializes in cannabis research. and he said when people take edibles, that's when they tend to go through the, like the, quote, not overdose, like a lethal overdose, but they take, it's very hard to gauge the kind of plane of high when people take edibles if they don't take them regularly.

29:34Andrew Huberman:That's what lands people in the ER with the psychotic episode. Yeah, me too. And people who are prone to psychosis definitely need to avoid high THC. A lot of the madness you see out there.

29:43Sean Hayes:When you're eating, it's hard to know how much is too much because sometimes - Yeah, dude, because like I might be hungry

29:48Will Arnett:and the cookies look good. That's the problem, dude. I dig brownies. Yeah, I've OD'd on THC a couple, not OD'd, but I've taken too much THC a couple times and it was just like, I was lying on the bed one time. I took so much and I was like rocking and I'm like, Scotty, Scotty. He's like, it's okay. It's gonna be okay. And I go, God, it's been like three or four hours. He goes, it's literally been two minutes. I was like freaking out. I slept with my eyes open the whole night. It was awful. Terrible. I was not asleep, by the way. I was not asleep.

30:18Andrew Huberman:Yeah, well, people who take cannabis to sleep of any kind, in any amount, they're getting no REM sleep, no rapid eye movements. Oh, that's interesting. Everyone that comes off cannabis, they talk about how incredible their dreams are, how vivid their dreams are. You get a REM rebound. REM is when you consolidate memories. REM is when you learn the most information. You consolidate what you learned. REM is essential. Just a little tip outside of cannabis, for anyone that wants to increase the amount of REM sleep they get, There's a wonderful trick, which is you'll have to adjust the thermostat if you don't have a way to adjust the temperature of your bed.

30:50Andrew Huberman:But either way, increase the temperature in your sleeping environment in the last hours of sleep. So you want the room cold to fall asleep and stay deeply asleep. But toward morning, even if you have to heat up the room as you get toward morning, and your REM sleep will increase fairly significantly. I won't do it. I won't do it. You won't do it. It's too hot.

31:09Sean Hayes:And would you say that your REM sleep is really good? I mean, it's okay. So maybe you should do it. No, but I mean like what wakes me up is when it's too hot.

31:16Will Arnett:Are you saying, doctor, that if I'm dreaming a lot and I'm kind of remembering a bit of my dreams, does that mean I'm getting REM?

31:25Andrew Huberman:Yes, especially if the dreams are vivid dreams. We tend to get more REM toward the end of the night and more deep sleep at the beginning of the night. The way to get the brief description of this is that at the beginning of the night, you go into a deep, slow wave sleep. That's more about bodily repair. The dreams are kind of unusual. they don't really have a lot of emotional content. The way to maximize the amount of deep sleep, in addition to not drinking caffeine too close to bed, et cetera, all that, is to try and get to bed at more or less the regular time, plus or minus 45 minutes. We're all human, right?

31:57Andrew Huberman:Because you're going to capture that deep sleep, and then the wave passes. The way to maximize your REM sleep is to basically make sure you sleep long enough. So some people need six, some people need eight hours, whatever it is for you to feel refreshed. but that last part of the night if you can increase the temperature now Sean, it sounds like you have a high core body temperature, that's great, that reflects a high metabolism, these are all wonderful things so you might just need to keep the room a little bit cooler than most this is all relative

32:27Sean Hayes:you're just making me think so last night this dream, this is not a joke I was just thinking about it, it just came to me I had a sick dream last night I was in the back of a truck, this is totally true with a bunch of dudes and we were all wearing, same dream. I'm not making this up. We're all wearing ghillie suits, right? Like those, like onesies? You know, like snipers wear when they go, when they're like, you know, trying to camouflage themselves. And the rest of our crew went off and then this one guy goes, you and me, and we jumped off and we went in and then we put up a bunch of branches so nobody knew which way we went.

33:02Sean Hayes:We went off from our regular crew and we went off on this path and we saw this, I'm not kidding. I'm just kidding. I'm listening. And we saw this hill. And we saw this shadow of, and he's like, those are the Russians. And they were up on this hill. And we were going to go and try to outflank these, this like, this sort of like Spetsnaz group over on the other, on this other hill. It was sick. I'm just, I'm just, it was so vivid.

33:26Andrew Huberman:End of story? Shit, hang on. Let him speak. Well, there's actually what we say in science, a mechanistic weave here that's, so get this. One of the things that happens during REM sleep is your acetylcholine levels are high. Nicotine, believe it or not, is called nicotine because it binds to the nicotinic acetylcholine receptors. People who take nicotine, and I'm not suggesting people go out and start taking nicotine, and I have no financial relationship to any company that makes nicotine whatsoever, that when you boost your acetylcholine levels by taking activation of that system with nicotine, it actually will increase— You turn into a sniper?

34:02Andrew Huberman:Well, in your case, yes, but you will increase the amount of REM that you get a little bit that night when you sleep. How about that? But, Will, there's one thing I really have to give you. Yeah. And actually for all the men out there and on this podcast, but it will offset some of the vasoconstriction and blood pressure increase of your nicotine. But I had a guy on my podcast who's a colleague of mine at Stanford, Mike Eisenberg. He's our head of male sexual health and hormone clinic at Stanford. Here we go. He's an MD-PhD. He is the top-notch doctor in urology and this area, okay? He's a serious scientist and clinician.

34:38Andrew Huberman:His words, every male 40 years or older should be taking low dose, meaning 2.5 to 5 milligrams of Tadalafil each evening to lower their blood pressure, dilate their capillaries. At higher doses, this is known as Cialis, right? Used for erectile dysfunction. However, this drug, Tadalafil, was initially developed to treat blood pressure and to dilate the small capillaries of the brain and body in order to encourage prostate health and to encourage brain health. And there's a lot of evidence as to why this is a good thing. It's very inexpensive. It costs pennies now because it's generic for people out there.

35:18Andrew Huberman:You do need a prescription. But my colleague, Mike Eisenberg, he didn't tell me to say this, but when we're talking about vasoconstrictors, high blood pressure, stress, stroke, some of the leading causes of death, every male in particular because of the prostate, women should talk to their doctors whether or not this is applicable to women. But it will help offset some of that blood pressure and vasoconstriction increase. That's amazing. Now listen, every single day, I know you talk about supplements too. I wanted to bring this up to you because this is what I take and it has the word nicotine in it.

35:47I take metformin, and then I take nicotinamide, is that what I'm saying? And resveratrol. Okay, so you're taking nicotinamide.

35:54Andrew Huberman:I take it every day for like three years. Yeah, which is in the NAD pathway. Okay, so let's break these in two. Metformin is to lower blood sugar. How long does he have to live?

36:04Sean Hayes:Just say it.

36:05Andrew Huberman:I mean, you guys are great. I can do like an age guest thing, but everyone here looks like they're in their late 30s, early 40s. Oh, it's great. Likewise. Yeah, thanks. Yeah, I just turned 50. I feel really good. We're all mid-50s. We're all over 55.

36:20Will Arnett:Wow. But can play, I don't know what kind of scripts you've got. We can play from these mid-30s, late-30s. I don't know what kind of – If it's a rom-com, it may be later. Can even go boyish.

36:30Andrew Huberman:Like, you know what I mean? By the way, I loved your Macaulay Culkin episode. I listened to that. I was like, this guy is so grounded. I can't even imagine being famous from that young of an age, you know? And, I mean, and he's like – he's like – you know, he's hyper-famous. And he just seems so, so grounded. I'm sure he's gone through the wickets to get there. But I was very impressed at the person he is. He's talking about how grounded he's about everything from Legos to parenting to acting. Yeah. It was awesome. It was great. Yeah. Great guy. Great. That came up because you were talking about child actors or something.

37:02Andrew Huberman:I think I still frame him in Home Alone.

37:04Sean Hayes:Yeah.

37:04Andrew Huberman:So supplements. To be very clear, I know I often get kind of put into that supplement cold plunge category. Look, get great sleep, sunlight. I'm all about sleep, sunlight. If you drink alcohol, limit it, offset it with good behaviors, cardio resistance training. I mean, I've been doing that stuff since I was in my teens, and I'm really committed to the behaviors come first. There is a place for some people for supplements. Metformin lowers blood glucose, blood sugar. So you can have more cheesecake, yeah. I mean, it seems to work for some people, especially who tend to run high blood sugar levels.

37:40Andrew Huberman:Very high. Some people will know the kind of a poor man's version of this is actually a tree bark extract called berberine, which accomplishes the same thing. I'm writing it down. I mentioned that because, but then you would want to stop taking metformin. You'd obviously want to talk to your doctor. The other thing you're taking, nicotinamide, nicotinamide rabicide is in the NAD pathway. Okay, NAD got a lot of attention a few years back as a potential longevity thing. Yeah, right. We all make NAD and levels of it drop off with age. There is no direct evidence yet in humans that increasing NAD, either by taking what's called NR, which is what you're taking, or NMN, can extend lifespan.

38:22Andrew Huberman:However, it does seem to increase energy and NR in particular, what you're taking, there's some good human studies that it can reduce inflammation in the body. Oh, nice. And I'll say also again, no financial relationship to any NAD, NR, etc. Likewise. I take sublingual NMN in the morning to increase energy. M &Ms? NMN. Oh, got it. It's different. You could either take NR or NMN. Here's the interesting thing about increasing NAD. I notice, this is just anecdotally, but so do other family members, et cetera. When I take NMN or NR, my hair grows very, very fast. My nails grow very thick. Yeah, me too.

39:00Andrew Huberman:It definitely is doing something for growth of those cells for me. For me. Me too, yeah. There's been no clinical trials on this. I would just continue with what you're doing if you feel good and you have a good doctor that you're working with. Yeah. And how do you feel? Do you wake up feeling pretty good? Finally, thank you for asking. I feel great. I feel terrific. No, I feel, I could, we need to do like a side, you know, Zoom or whatever. Well, Sean, can we get into it?

39:29Sean Hayes:It will cost you. Can we get into it a little bit? Because we touched on it and you do feel good. And there's very good observation. Sean does tend to have a lot of energy in a release room. But, and I give you a lot of shit about it because I do love you and it's funny, but it's also, I do worry about your sleep. My sleep and also sugar. Well, sugar, and there might be a correlation, and I'm sure there is. But Sean, and correct me if I'm wrong, you'll go to sleep at a relatively decent hour and you'll often wake up, and this has been for years, in the middle of the night. That's right. And then you're up and you send emails and you text and you do stuff.

40:05Sean Hayes:You make phone calls and you're up. And then that might be 3, 4 in the morning. Correct. And you'll be up till like 7. Correct. And then you'll go back to sleep for like 2 hours. Or an hour, 2 hours, yeah. Hour, 2 hours. And I'll sleep really hard. And you'll sleep what you think is really hard because you're exhausted. Yeah. But there's, and this isn't just sort of once a week. This is, that is the rule more than the exception. That is correct. That that is how you get your rest. Yeah. Is that bad? Because I read one, like, you know, I read a long time ago a doctor said, you know, we should all sleep like babies.

40:37Like, if you're tired, lay down. If you're not, get up.

40:40Andrew Huberman:I, many nights do exactly the same thing, Sean. Call me. I would... I'll call you back. Okay, great. Yeah, we'll work side by side. Call me. You know, a couple of things. I mean, some people, there's a theory that some people have this sleep architecture just naturally. That theory has been kicked around back and forth. Here's the thing. Because I sleep worse if I fight it. Don't fight it. One of the worst things you can do, this is very important for everybody listening, one of the worst things you can do is stay in bed trying to sleep for more than half an hour. Yeah, that's right. Your brain is a prediction and sort of parrot association machine, which is nerd speak for, you will start to associate your bed with a battle with sleep.

41:25Andrew Huberman:That's right. You do not want that. Get up and get out of bed. If it takes you more than 30 minutes to try and get back to sleep, get up and get out of bed, go do something. It is a good idea, however, to have a more or less normal to bedtime that's right for you. Like sleep hygiene, yeah. Well, and we know that some people do great going to bed late and some people go to bed earlier. Oftentimes people who wake up at 3 or 4 in the morning or 2 or 3 or 4 in the morning and can't get back to sleep but are still tired and then need to go back to sleep. I'm raising my hand here as one of these people.

41:57Andrew Huberman:sometimes getting to bed a little bit earlier than you happen to be getting to sleep can help. Meaning getting into bed around 9, 9.30, falling asleep at 10. And then it just may be that you're not getting enough of that early deep sleep that your body craves because it's very easy to push through tiredness. It's hard. We can't make ourselves sleep, but I have some great tools to help you fall back asleep if you want them. But my first question is what time do you go to sleep? About 11 o 'clock, between 11 and 12. I'm always almost like sleeping by 12, 15. Okay, so you're falling asleep quickly.

42:30Andrew Huberman:So we could go through a lot of diagnostic aspects.

42:33Sean Hayes:And you're watching television generally up to that point, right? No, up to, yeah. Or looking at your phone. Like last night we started watching The Godfather Part 2 and I put that subtype on because I couldn't hear. Anyway.

42:44Andrew Huberman:Yeah. So great movie. Okay, I'm going to give a general theme for everybody because some people are early risers and late night owls.

42:54Sean Hayes:Before you get in, because this might be a part of it, and maybe you can answer this too, because I actually said it to my 17-year-old last night. Again, I had heard, read, whatever, because we're all experts these days, that going to bed earlier, getting those early, those first hours before midnight and the importance of those hours versus post-midnight, etc.

43:17Andrew Huberman:Can you factor that into it too? Yeah, and it changes across the lifespan. in. So teens often need more sleep. For social reasons, they're going to push later sometimes, and we just have to live with that. And like no, no healthy kid wants to go to bed at nine o 'clock. Right, right. You know, it's just, you know, so I think it's important to eventually, by the time you hit your thirties, to figure out kind of what, when would you go to sleep if the rest of the world didn't exist? When would you wake up? And what's your natural rhythm? And it may be that this is just your natural rhythm, Sean.

43:48Andrew Huberman:Yeah, that's right. It could be. It is true that you can create lighting environments that are best for sleep and wakefulness. And it's very simple. I'll just make this very, very simple. You want very bright mornings and you want dim, dark nights. In fact, there's a beautiful study out of the UK that showed with more than 80 ,000 human subjects that just making your days brighter, working near a window, obviously I'm big on getting sunlight in your eyes first thing in the morning. But if you can't do that, bright lights inside. Getting outside as much as you can during the morning, especially before 10 a.m., whatever you can get, even if you're taking the kids to school, et cetera.

44:26Andrew Huberman:And then dimming the lights in the evening. I'm not saying everyone has to go to a red light environment and look like a biohiker. Dimming the lights, bringing the lights down, dimming your screens. Totally. That, in combination, that in combination, greatly offsets depression, anxiety, symptoms of OCD, even mania. so much so that even if people are in dark environments during the day, if they make their nighttime environment truly dark, they benefit. And there's a whole story about cortisol behind this, but for time's sake, I won't get into it, but this is a very real thing, and a modern life has completely inverted this.

45:01Andrew Huberman:Our days are too dim, and our nights are too bright. So just try and adjust things a little bit in each direction. I don't understand how people can sleep with blacked-out curtains. Like if I wake up and it's, you know, and it's bright outside. You feel like you're trapped underground. Yeah, exactly. Or like in a drug, you know, three-day drug excursion. But so I have to sleep with, right? That's good to sleep with the curtains open so light comes in in the morning, right? It's great. I think everyone should invest, because it's very inexpensive, in a comfortable eye mask. You know, one of these soft eye masks that Velcro in the backs, you can adjust it.

45:37Andrew Huberman:You know, not one that's just like fixed on there.

45:38Sean Hayes:And it lets your eyes move.

45:40Andrew Huberman:Yeah, lets them breathe a bit. And then, you know, you may, try this for me one night, Sean. Get a hold of some earplugs that are those, they're like wax. There's like a firm wax that you put on the outside ears. You don't jam on the smartphone. You may be waking up because there's noises in your environment that you're not aware of. And just see if, you're convinced this is you. The noises are coming from inside the house. You know, I'm thinking this is you. I'm thinking. I'm thinking. Oh. Oh. I'm thinking.

46:10Oh, man. Scotty!

46:13Sean Hayes:Fuck! No, I sleep with a fan on

46:15Andrew Huberman:because it's sort of block out all noise. And I think you're doing great. Yeah, my biggest fan. And if you can afford to get back to sleep a little bit, that sleep that you said you sleep really hard late in the morning, that's REM. You're dropping back.

46:27Sean Hayes:Sean, have you thought about propofol?

46:30Andrew Huberman:By the way, I get it. That's a steady drip. I get it.

46:34Will Arnett:Hey, Doc, what got you into medicine? Why? You have a parent that was in it, or did you have a fascination with health when you were a kid, or both?

46:44Andrew Huberman:Okay, well, I'm a researcher, not a clinician, so I profess a lot of things. I want to be clear about that. But my dad's a theoretical physicist, so I was exposed to a lot of science. So none of it's been proven. Good, good. Just for what it's worth. I like that. the internet would say, we don't know anything. I mean, it's kind of scary what's happening now with kind of like calling all fact into a question. So here's the deal. My dad is an academic. He came here from Argentina, first generation immigrant, and to study physics. And I grew up in the South Bay Area at a time before the personal computer, et cetera.

47:25Andrew Huberman:But I was surrounded by science and technology as a kid. And always loved biology, always loved fish. I've got my fish tanks. I've always been fascinated by animal behavior, human behavior. And then in high school, I went to a quite good public high school. I, you know, for reasons related to, you know, teenage rebellion and home environment, I rebelled against all of that and got really into the skateboarding punk rock scene in the Bay Area and have a lot of friends who went on to start skateboard companies. And I got, we could talk stories about that at some time. I was actually, Tony Hawk's dad took me to his house when I was a kid, so I got to sleep in Tony's room.

48:04Andrew Huberman:No, Tony wasn't there. People always ask Tony when he was there. And I got exposed to a lot of action sports and music culture and really loved that. But it wasn't until college that I circled back to science and biology. I realized I needed to get good at something. I wasn't very good at skateboarding. I wasn't going to be an athlete or a musician or anything like that.

48:25Sean Hayes:You look like you could be an athlete, though. Well, I've always worked out.

48:28Andrew Huberman:I've always done skateboarding, soccer, swimming, running, lifting. I enjoy sports, but I wasn't very good. I wasn't bad, but I wasn't very good. And so I had the good sense, fortunately, and some input to go, you know, what do I really love and what could I get good at? And I love learning and I love teaching. I love learning and I love teaching. That's just kind of like who I am. I can't help myself. And so I got really into psychology and biology. At that time, they called it biopsychology. There was no field of neuroscience. And I started working in a laboratory. And I got super serious about school.

49:02Andrew Huberman:So I did my undergraduate, my master's, my PhD, did a postdoc at Stanford, and eventually was hired back to Stanford as a tenured faculty member. Running a lab and doing experiments with my hands is pure joy for me. I don't do it these days because of the podcast, but I still teach at Stanford. I still have my position there. And nothing makes me happier than learning information that I think people can make use of and telling them. And not telling them what to do, but just going, hey, you might want to check this out, or you're not sleeping well, or hey, maybe your sleep is just fine. And I feel like there's been very little opportunity out there in formal education to teach scientists and physicians, clinicians, how to communicate with the general world.

49:43Andrew Huberman:And it's usually like they have to market their book or they're talking about their thing. I love actually talking about other people's science. I hardly ever talk about the science from my lab, but we've published lots of papers and have fun doing that. We could talk about that. But I just love learning and teaching. And so I'm, like I said, I'm 50 and I'm just like in bliss. The podcast lets me teach very broadly. Stanford's been super supportive. I still teach the students there. And I guess it was faded through my dad. My mom's a writer. My dad's obviously a scientist, but I just, I feel like the only downside of getting old for me is, or is that I'm excited about what science and medicine are going to discover.

50:22Andrew Huberman:And I just want to learn about it. It's not even so much that I can use it. I'm not thinking about eternal life or anything. It's like, think about how much we've learned in the last 10 years about gene editing, immunotherapies for cancer. I'll make a hard stance here, and I'm not doing this for any political reasons. I mean, whether or not you were pro or anti or skeptical about vaccines during the pandemic, these mRNA technologies are incredible. For cancer, let's just leave, you can edit this out if you need to, but let's leave COVID aside.

50:52Sean Hayes:Let's get into chemtrails after this.

50:54Andrew Huberman:No, no, but these, you know, I went on Bill Maher and talked about this. And I take a lot of heat for this because I'm sort of at the interface between the standard academic medical community and the kind of wellness, I hate the word, but biohacker community. And they're really like at loggerheads. But the truth is there are pearls of wisdom all over the place. But science and medicine are the bedrock of everything I described. It's, you know, the only reason we even know what glutathione is or that light and temperature impact sleep cycles. And, I mean, it's so important. And I'm like, I'm on a mission to teach what I think is the best of science and medicine as I can see it so that people can make it useful to themselves and understand that one of the reasons that we are where we are these days is because of science.

51:42Andrew Huberman:And I just love it.

51:43Will Arnett:Right. We'll be right back. Oh, boy. You know, we talk about closets a lot on this show. We sure do. Kicking the door down, coming on out. We're basically talking about that closets are for clothes. Oh, I just knew. And I've taken that too much to heart because my closet is stuffed. I've been meaning to go through my closet. Oh, you should sell some of them. I should sell it. I mean, listen, you know, what feels familiar in my closet may be exactly what someone else is searching for. Buy, sell, and discover affordable secondhand fashion you'll love with the resale marketplace, Depop. Reselling can feel overwhelming, but on Depop, getting started is easy.

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53:56Will Arnett:So you're saying with Hilton Honors, I can use points for a three-night stay anywhere? Anywhere. What about fancy places like the Canopy in Paris? Yeah, Hilton Honors, baby. Or relaxing sanctuaries like the Conrad and Tulum? Hilton honors baby. What about the five-star Waldorf Astoria in the Maldives?

54:15Andrew Huberman:Are you going to do this for all 9 ,000 properties? When you want points that can take you anywhere, anytime, it matters where you stay.

54:23Will Arnett:Hilton for the stay. And back to the show.

54:30Sean Hayes:There's so much noise out there, and there's so many people out there now professing. Like, a lot of people learned about that they should sleep with their room at 68 degrees because they heard Tom Brady say that in an interview, right? So everybody's getting these little bits and pieces, and they're going, I heard that you should. I just did it myself. Everything's a trend. I heard you should get the sleep before midnight. I heard that you should get this. The vaccines, I heard this. And there are so many people out there who are speaking about in this space, whether it's wellness or medicine or whatever they're calling themselves.

54:58Sean Hayes:And you even, I forget the term you used, the sort of the, what did you say? The sort of the cold plunge. The biohacking. The biohacking cold plunge crew. Everybody's a fucking expert. There's all these fucking people. And there's a little bit of fatigue because part of me is like, God, it feels like I want to put everybody in the same bath. They're all anti-vax, fucking chemtrail, fucking nobody. Don't trust the government. Don't trust anything. And there's just so much of that out there that it's like, what the fuck? What is real anymore, dude? Yeah, exactly.

55:30Andrew Huberman:So what I like to do is take a step back and think, okay, you know, why do people end up in these bins, right? Not how did we get here, but kind of like where are people showing up to the table? And I think that I said a lot in favor of science and medicine. I'm now going to say as an insider what I also know, which is that the field of science and medicine has done a mediocre job of explaining why, the why behind things. They tell people what to do, but people like to understand the why. People are deeply rational at some level until they're not, right? And so I think that something I really believe in is that how people come to learn information strongly impacts whether and how they use that information.

56:15Andrew Huberman:One of the reasons I do longer form podcasts where I explain mechanism, okay, is because I do think that if you understand that bright light, cold water, exercise, and caffeine will spike your cortisol in the morning. And guess what? You want your cortisol high early in the day. And dim light, lack of caffeine, cooler temperatures will lower your cortisol in the evening and help you sleep. Once you understand that you want that seesaw tilted high in the morning, high cortisol, you want this. I don't care if you're male, female, pregnant, young, old, whatever, and low cortisol in the evening, lower your heart rate, do some long exhale, breathing, et cetera.

56:50Andrew Huberman:Once you understand there's a mechanism behind it, then when somebody says cold plunge is great and you say, yeah, but early day makes more sense than later day. Or how about, you know, bright light early in the day? Makes sense. You need your cortisol high. Cortisol sets a wave front of energy for the day. You want it low later in the day. Once people start to understand a little bit of mechanism about dopamine, about cortisol, about sleep, then all the stuff coming at them, they can filter it through a rational filter. Wait, does this make sense based on the bulk of what we know? Now, when it comes to things like vaccines and prescription medication, let's take a slightly less barbed wire version of this, but that's very timely, which is all this stuff about the GLP-1s, right?

57:32Andrew Huberman:People are saying, oh, you know, so many people are on GLP-1s. What is that? It's very interesting. The weight loss. The weight loss thing. Like Ozempic or whatever. Very, very interesting peptide that we knew about from Gila Monsters. You know, it was discovered in Gila Monsters, these reptiles that only need to eat once every year or so. A smart biologist said, how come they don't get hungry all year long? Turns out they have very high levels of GLP-1 circulating. Isolated the peptide. We now have GLP-1s as perhaps the first really effective treatment for obesity and diabetes. Amazing. And it's also turning out to be very effective.

58:05Andrew Huberman:that we need more data, but for people who have what they now call alcohol use disorder, can really reduce cravings for alcohol and sugar. So what happened was the medical community came out and I know that's what they call alcoholism now. Yeah, everything's a pseudonym.

58:22Sean Hayes:Hi, my name's Will and I'm an alcohol use disorder.

58:26Andrew Huberman:It's interesting. The only people, the people who have no trouble with the word alcoholic, I have a lot of friends, I go to meetings like that, they are like alcoholics, right? Right, former alcohol. They go, pardon, right? But everyone, you know, anyway. Here's what's really, I think, so vital for us to understand is that, you know, if you look at the GLP-1s, they're very effective at lowering body weight. They are high cost because there's still not generic versions of them out there. The wellness biohacking community was very disparaging of this. Like, oh, this is just a shortcut. This is bad for you.

59:00Andrew Huberman:There were some side effects. And indeed, you have to be careful with these things. I'm not taking them, but I know people that do, and they can be taken safely. But the moment that the GLP-1s hit the compounding pharmacy market, and it was inexpensive, it was suddenly like the wellness biohacking community was like, oh, okay, this is great. This is just like a supplement, no problem. So people are just too entrenched in the camp they're in. I like to think, Will, I don't know, you tell me. I like to think that there is a league of reasonable people out there that represents the majority of people that are not so polarized.

59:32Andrew Huberman:They're not talking about chemtrails, and now I'm going to get hate from the chemtrail people. I don't believe in chemtrails. What is a chemtrail?

59:40Will Arnett:I have no idea what that is.

59:41Andrew Huberman:There are people that think that the government is using chemicals from airplanes across the sky to reflect sunlight.

59:49Sean Hayes:Block the sun to reduce the effects of global warming, et cetera, or depend on the day. Oh, yeah, yeah.

59:54Andrew Huberman:There were plans to put a mirror in space not that long ago to reflect sunlight.

59:59Sean Hayes:And they try to conflate it with cloud seeding, which has been done since the 50s. That's crazy.

1:00:06Will Arnett:Mirrors in space is something I've been a proponent of for a long time. That's true, by the way. It is true. That's the way you look back into time, effectively.

1:00:14Sean Hayes:We had Neil deGrasse Tyson and Jason had a very robust conversation with Neil about time travel using mirrors.

1:00:21Will Arnett:It has to do with the speed of light and stuff like that. Doc, you wouldn't understand.

1:00:24Andrew Huberman:No, but my father would. So the important thing, here's what I'm hoping. We're 2026. Here's what I'm hoping. What are you most excited about 2026? Because there are so many useful tools that don't involve taking anything, supplement or drug, that are very useful. There are also very useful prescription drugs out there that have helped save lives. And I think people are coming to that clarity now. And there are also some over-the-counter supplement things that can help that are not as extreme as either. But I think that we are finally seeing a blending between the silos of these extremes of conspiracy theory versus unless there's a double-blind placebo-controlled study, there's no way I'm going to do it type people.

1:01:13Andrew Huberman:Yeah, yeah. And I think Los Angeles, to be fair, I've lived west of Interstate 5 my entire life, northern Southern California, the middle of the state. Los Angeles is the place where this stuff got blended together. Yeah. Okay? Right. And as a, because people here are experimental. Okay? Right. They're experimental. They like to try things and see what works, and things get marketed and get put out there.

1:01:33Sean Hayes:There are no bad, there are no bad suggestions, you know, especially after midnight. Right, right, right. Back to Jason's original question. So your dad was, I'm kidding. I know.

1:01:43Andrew Huberman:So, go ahead. I do want to do, I was thinking. We talk about my dad. He's still active as an 82-year-old scientist, and he's physically well. I love that. Yeah, he's still super strong. He doesn't look like that dude

1:01:55Sean Hayes:who's trying to biohack his age, right?

1:01:57Andrew Huberman:Oh, not at all. No, no, no. He's quite virile and robust.

1:02:01Will Arnett:Would you agree that our generation, like us four ding-dongs, have a good shot of living to be 100? That this generation... Easy. Yeah? Oh, really? 100, yes.

1:02:10Andrew Huberman:So I think 120 is probably the genetic limit, natural genetic limit on age. I think... At this point. At this point. Look, I posted something yesterday that I just found online of a confirmed 90-year-old guy, not on any hormone augmentation. Oh, I just saw that. 20 push-ups. And real push-ups. And the best part is in front of his kids and grandkids. He's got his family there, takes his glasses off, gets down on the floor. And he does 10 full, like chest to the floor, full range push-ups, stops midway, teases his son about doing partial reps, and then goes back and does the remaining 10. and then stands up and basically, guys, 90 years old.

1:02:51Andrew Huberman:It's so clear that because, to answer your question, Jason, by drinking a little bit less, focusing on sleep a little bit more, working on limiting our stress a bit or a lot more, doing things that really bring us meaning. This is huge. We know this from all the Blue Zone stuff, but from everything else. Social connection, like really trying to put the phone away and drop in with people. And really, it's such a critical.

1:03:16Sean Hayes:Sean.

1:03:17Andrew Huberman:It's wonderful. It's also biological, right? It's biopsychological how it benefits us. Plus, you know, nutrition's gotten better. I think that it's harder. The problem is it's expensive to access good food, right? But nutrition's gotten better than it was in the 90s. We're no longer messing around with trans fats. Not everyone's smoking. If you're using nicotine, hopefully you're using it on cell phone. You know, I know a lot of nerds. I'll tell you, I know a Nobel Prize winning neuroscientist. Everyone in my community knows who he is. and the first time I met him about 15 years ago, he chewed no fewer than five pieces of Nicorette during our meeting.

1:03:51Andrew Huberman:And I said, why do you do it? And he said, it's protective against Parkinson's and Alzheimer's. And he said, but you don't want to smoke because it'll give you cancer. So that's an anecdote. But, you know, so -

1:04:01Sean Hayes:I want to take a photo that you and me, we're going to go out, we're going to go to, we're going to get a cheese, we're going to go get a Big Mac and smoke a cig and we're going to post it online just to fuck with people's brains. All right. Just to cause it, let's just do it. Fair enough, new science out. You know what I mean?

1:04:15Andrew Huberman:Just fuck it. Just to mess with them so they all can relax. Wait, to be clear, I'll eat a cheeseburger. Yeah, good. I eat meat, cheese, fish, eggs. I mean, I eat fruits and vegetables. You know, I eat like a human. I eat like an adult. The thing to do is eat like an adult. Don't slurp your food. Don't drink your food.

1:04:29Sean Hayes:Sean, what'd you have for breakfast today? Be honest, go. I haven't had anything except for all. What's coming up? I'll probably have a... Be honest. Cinnamon roll? There's a cinnamon roll in there. There's also a chocolate chip cookie. And also there's... Oh, my. Yeah, but I'll probably have yogurt. That's why you take the Metformin. What did you have yesterday? What did you have yesterday morning when I called you and you were on the way, you were in the car with Sean? I did really good. I had carrots and cucumbers dipped in ranch. No, yesterday when you drove. Oh, I went to Portillo's, yeah.

1:04:57I drove to Portillo's in Buena Park. There's one in Buena Park.

1:05:00Will Arnett:Oh, I was going to say, you're in Chicago. So sugar's your thing, huh, Sean? Yeah, it's too bad. Anyway, listen, Andrew, we only have a couple minutes left because it's taking way too long. And I just want to know, just as fast as you can, because I don't want to keep you, is my mom died of Alzheimer's, And I like talking about it just to learn more about like what causes it and how to prevent it. And I took the, is it APO1, APO4 gene or whatever? I don't have the gene. It doesn't mean I can't get it, but I'm less likely to get it because I'm not right predetermined through genes. But what, you know, anytime a report comes out that we're three to five years away from a cure or we're three to five years away from something positive about conquering this horrible, horrible disease, I don't know if you've been around it, but it's just awful to see somebody go through it.

1:05:53Is that the pharmaceutical companies like making sure we don't come up with the cure? Like what are the realistic, you know, feelings about the future of cure for it.

1:06:05Andrew Huberman:Yeah, well, first of all, I'm really sorry. It's devastating. I don't think people can understand until they see someone who's alive but deteriorating. Yeah, yeah, it's awful. It's awful. The pharmaceutical companies are absolutely working very, very hard to try and solve this problem, as are many labs. I'll just put in a plug. Funded by U.S. taxpayers, I have to say, my lab was funded by NIH for many years. This is the thrust of discovery, not just in the United States, but all over the world. I'm working hard behind the scenes to try and make sure that funding is maintained. Those discoveries get turned over to companies, pharma companies, which test drugs on animals and then humans.

1:06:44Andrew Huberman:So it is happening, yes. They're not trying to keep us sick. Those theories need to go. Also, think about if it was just purely financial incentive. The person that comes up with that treatment for Al's Conference is their cure. Yeah, of course. Like, okay, what can we do? Obviously, blood sugar management seems to be one important piece. It used to be people were starting to talk about, quote, unquote, type 3 diabetes, not a real thing. Some people do seem to benefit from a ketogenic diet for offsetting some age-related dementia, but not everybody. But it has to be truly ketogenic, and it's hard to stay on a ketogenic diet, okay?

1:07:22Andrew Huberman:Some people, not everybody, but managing your blood sugar. It does seem that the effects of exercise and quality sleep and avoiding environmental toxins, and I can talk about that in a moment, are significant toward offsetting age-related dementia. People with these gene repeats are at higher risk. It's great to hear that you don't have these repeats. But everyone should be trying to optimize on a daily basis, I should say, in real life context, get the best sleep they can. It's so clear that resistance training, doing some form for women and men, this is like a whole new world now, right? He used to tell women that you need resistance training.

1:08:01Andrew Huberman:They'd be like, I don't want to be too big, this kind of thing. Resistance training for strength in particular. So if you can get strong without getting bigger by training with very, you know, safe. Yeah, yeah. These are the things -

1:08:12Sean Hayes:Low weights, tons of reps. Yeah, or, okay, I would go the other direction,

1:08:17Andrew Huberman:but in any case, to maintain strength. I don't know. It's not sufficient to just walk and garden and do yoga. I'm sorry. I know there's some yogis. I agree. It's not sufficient. Yeah, you need weight. You need weight. And so maintaining healthy blood sugar.

1:08:31Sean Hayes:Wait, which goes back to do you lift, bro?

1:08:33Andrew Huberman:I mean, honestly, that's just. Well, now it's do you lift, girl? Because I'll tell you, I have a female training partner, and she's a beast. But she's not big. She's just super strong. Women, and, you know, I have a mom in her 80s. I'm trying to tell her, like, listen, you need to lift heavy for you objects. You need to do this. People, when they stop moving, I know it sounds like the usual advice, but when they stop moving, there's feedback to the, well, there's feedback to the brain that may help kickstart some of that neurodegeneration. That said, there are some genetic predispositions. Nowadays, we're all much better off because we all know that don't do.

1:09:14Andrew Huberman:The environmental toxin thing is interesting. There was the data that living next to a golf course put people more at risk for Parkinson's. These are correlative things. We are now discovering, okay, this goes in the opposite direction, Will, where people were, you know, all this like roundup stuff and, you know, cancer-causing agent. It turns out that was a real thing. Oh, yeah. You know, so...

1:09:33Sean Hayes:We have a friend who's...

1:09:34Andrew Huberman:Limiting exposure to environmental toxins to the extent that you can is going to be good, but you don't need to be hyper-paranoid about these things. So I believe there will be a solution. I just think like your time is your time. Like, you know, eat right, exercise, do good things. We could have saved an hour. And stay socially engaged. You know, my big push for 2026, I know we're out of time, and forgive me, I like to fire hose this stuff. No, I love it. People have useful things. I know they come here to hear you guys, not the guests. No, no, are you kidding me? This is fascinating. Well, is, like any technology humans build, It takes about 10, 15 years before we go, oh my goodness, we really screwed up.

1:10:20Andrew Huberman:And we're now realizing that with, here's the thing, people will listen to things for a long time, but they like to view things now in rapid succession. And when you put your phone away, it's going to feel a little boring for a bit. Good. Your brain, it's like a palate cleanser between life events. Putting your phone away, it'll feel like you'll feel restless, you'll feel bored. engaging with people socially or even with your thoughts, getting back to that a bit. I have a lockbox for my phone that it's locked in there for portions of the day. And it's rough, right? You're like online, all these movies, all this stimulation is very exciting.

1:10:58Andrew Huberman:Listening to podcasts is great. Audio long form stuff is great. This is my push, people. Put your phone away for a short while and drop in with people. And yes, it's going to feel boring for a bit, but then that's where from the health promoting and kind of life enriching stuff, that's where the good stuff is. I completely agree.

1:11:16Sean Hayes:And again, I see it because Jason and I both have teenagers. We see with the kids on the phones, et cetera. And I see it with my own kids. I've mentioned this many times. My big regret was giving my kids phones too early. But then I see it in myself. And if you guys, if you can, and again, this is just an observation. I started noticing in public places where I just sort of try to clock people on their phone, not just randomly, but especially people going in, like let's say going into an elevator or going to a restaurant, they order a coffee. I was in New York last week. And I watched people when they had, they make an order and then they have a minute where they got to wait.

1:11:52Sean Hayes:And everybody just out of habit pulled out of their phone. And sometimes they do it out of insecurity because they don't want to look like they got nothing to do. So they want to look like they're doing something. Otherwise they feel exposed and they feel too vulnerable in that moment to just stand there and be present. Check it out. It's really, it's fascinating. If you start watching people in stores, in restaurants, I'll do it on an elevator, Will. Like if I'm in an elevator and I'm with somebody and I'm just, I'll pull out my phone because what am I going to say? By the way, and the other guy does it too.

1:12:23Sean Hayes:Super entertaining. If people don't know how to engage with it, it's fascinating. You know what's fun is to not pull it out on an elevator

1:12:28Will Arnett:and just stare at someone the whole time.

1:12:31Sean Hayes:When everybody's looking out towards the door, you just stand looking inwards. and then wait till they look at you

1:12:37Will Arnett:and then just raise your eyeballs. Like, what? I'm not on my phone. That's weird, isn't it?

1:12:42Sean Hayes:And also bring back the art of winking. You know, start winking at people. A slow wink will really offset someone. Real nice. Andrew, we're winking at you. Thank you for coming today. Honestly, I know. This is so great. Thanks so much for having me. I could listen to you for hours and a half. And so I just, I'm a huge fan and I love fascinating to talk about it. Thank you for starting our year off

1:13:04Andrew Huberman:Just right, sir. Well, thanks, guys. I want to say, and I know I speak for many, many people, I'm a huge fan. Oh, please. What you guys, I know everyone's always jocking you guys, but here's the deal. From a very young age in many of your cases, but still now you really enrich the world with really entertaining and really stimulating, thought-provoking stuff. And I think long-form podcasts, movies, TV, that stuff I actually think can enrich us in a real way. And so that's not what I'm referring to when I talk about the phone stuff, and I think we all know. So I just want to say thank you. It's an honor and pleasure to be here, and I'm a big admirer of the work you do.

1:13:41Andrew Huberman:Thank you. Likewise. Thank you, man. Thank you, buddy. Thank you, pal. Keep fighting the good fight. Thank you so much. I'd love you. Yeah, you have to come back, and I have so many more questions. Anytime. Anytime. Thanks, Andrew. All right. Thanks, Andrew. Bye, pal. He's one of those guys that, he kind of said it, that he breaks down all that information so you can digest it in a way, you know, that we can understand it. And like, how does the person know all that?

1:14:07Will Arnett:Yeah, it is great. That's something that didn't, yeah, that didn't exist. Well, I mean, what, like WebMD and stuff like that started to like, you could just go there and start asking a bunch of questions. You didn't need to like make a doctor's appointment and stuff. And now it's like ChatGPT will kind of break it down a little bit more for you. But these podcasts or even like TikTok or Instagram, you get these little bite-sized pieces of information. But as he said, you do have to kind of like thin out what is just the entertainment crap and what is the science-based stuff.

1:14:35Sean Hayes:Yeah, and like what's conspiracy shit. That's what I was saying. Like there's so many people out there. At least he's a guy who's, you know, a professor at Stanford. So you have to try to like, I'm going to try to lean towards the people who have a little bit more sort of academic credentials.

1:14:51Will Arnett:Yeah, I mean science is still science and the other stuff is sort of, I guess has always been there. but it never had, as we've talked before, it never had the platform, the amplification, the microphone that it does today. And so it does seem like, well, what do you know? Like now, like, you know, you never know what's real. No, it's just that the noise just got noisier. The science is still there and still valid. You just have to self edit this new level of volume for nonsense and put it back down to its right size. Yeah, I mean, like, and all of the stuff that he does at Stanford and, like, he's into ophthalmology, psychiatry.

1:15:35You couldn't even. No, like, neuroscience. Sean, you know what I was going to say, Sean?

1:15:38Sean Hayes:And then just basic. Just because you have the, no, hang on. I think that, Sean, this is what I wanted to get to because you've had a few and I can feel you building up because you couldn't even get through your own setup. No, that's okay. But I want to say, as I heard you, as I heard him talking to you and you were talking about your sleep, and I was thinking, like, the different things, the light, the sound, the thing, the bedtime, and maybe all you really need for a good night's sleep is just a good, old-fashioned lullaby.

1:16:13I was going to do neurobioscience. Smart.

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