I'm Andrew Huberman, professor of neurobiology and ophthalmology at Stanford School of Medicine.

I'm also the host of the Huberman Lab Podcast, a weekly podcast focused on science and science-based tools for everyday life.

Today you're going to learn about practical tools for optimizing your morning routine.

So without further ado, practical tools for optimizing your morning routine.

There are certain foundational behaviors, do's and don'ts, that set the stage for you to be better at everything.

So a lot of times people will say, how can I lift more, focus better, remember things better?

It's like, well, let's think about the foundation of that.

And that's always going to come back to two elements, and that's sleep and what I call non-sleep deep rest.

So sleep is the fundamental practice or part of our 24-hour cycle, where if you don't get it on a consistent basis, you are down-regulating your ability to do everything, right?

Metabolism is screwed up, immune system is screwed up, et cetera, et cetera.

However, it is not the case if you get a one night's bad sleep or that if you're not sleeping perfectly that you can't perform well.

But let's talk about sleep and just because I think it's important.

The goal for most people, unless you're pulling vampire shifts on deployment or you're a shift worker, and thank you shift workers, we'll talk about shift work, you should try and get really good sleep 80% of the time, 80% of the nights of your life.

The other 20%, I hope you're not getting good sleep for good reasons that you enjoy.

But the point is that there are a couple of things that you can do.

First of all, every cell in your body has a circadian rhythm, meaning every cell has a 24-hour circadian clock that's regulated by genes.

Think of your body as a bunch of millions of clocks and you need to align those clocks to a single time.

This is why when you travel overseas, your gut goes off or it's more easily you get sick or your thinking isn't quite right, the clocks aren't in alignment, they're not entrained as we say.

Number one practice for everything, sleep especially, is try and get some natural light in your eyes within an hour of waking up.

If you wake up before the sun, turn on a bunch of bright lights and then get sunlight in your eyes once it comes out.

If there's dense cloud cover, there are still more photons, light energy coming through that cloud cover than there are coming from artificial lights.

So try and get five to 10 minutes without sunglasses outside in the morning once the sun is out most days, if not all days.

This has an outsized effect on a number of things.

First of all, it modulates the timing of what's called the cortisol pulse.

Once every 24 hours, you're going to get a boost in cortisol, big spike in cortisol.

It's a healthy boost.

It sets your temperature rhythm in motion, sets your level of alertness, your level of focus, and your mood.

You want that cortisol pulse to happen as early in the day as possible.

What's triggering the cortisol pulse?

The cortisol pulse is naturally entrained by these genetic programs to happen once every 24 hours, but light will anchor it to the period where you see bright light.

Got it.

A late shifted cortisol pulse.

So imagine the kid that wakes up and spends the morning in bed or you're spending the morning bed and you're texting or you're indoors and you're typing on the computer.

That's not enough light to accomplish what I'm talking about.

And then you go outside around noon or one.

You're in what's called the circadian dead zone, which is the time in which light arriving at the eyes can do certain things, but it can't time this pulse.

That means that cortisol pulse is going to come in the afternoon, which means that your temperature rhythm is going to be shifted late.

And that's actually a signature of depression and anxiety and difficulty falling asleep.

Many people are waking up and they're just spending time indoors and they're putting on sunglasses, getting in their car and driving, or there's cloud cover and they think there's no sun out.

I don't mean that you actually have to stare at the sun, never stare at any light so bright it's going to damage you.

Please don't.

And blink as necessary.

But the indirect rays from the sun trigger these cells in the eyes called melanopsin ganglion cells.

These ganglion cells, these are neurons.

They send a signal to your hypothalamus.

Then the hypothalamus releases this peptide, which is a wake up signal for your whole brain and body and sets a timer for the onset of melatonin release 16 hours later.

Melatonin being the hormone that makes you sleepy and makes you want to go to sleep.

So you can imagine what happens if you don't get that light until a few hours later, everything shifted and then you want to go to, you don't know why you're wide awake at 1130 or 12 and everything's messed up.

The other thing is that you can get bright light from electronic devices early in the day, but it's not enough.

You need photons from sunlight.

Now, if you live in Scandinavia in the depths of winter, if you're up in like Trondheim or Aarhus or something like, okay, fine.

Don't buy an expensive daytime simulator.

Get one of these led light boxes for drawing.

They're very inexpensive in comparison.

You can find them on Amazon.

I don't have a relationship to any of these brands, but they're easy to find 20, 30 bucks.

Put that on your desk and just look at that thing for a few minutes in the morning.

Not as good, but better than being in the darkness.

Then when the sun's out, get outside.

This is a huge, huge effect for the following reason.

The signal that arrives from the eyes to the hypothalamus also triggers the release of the neuromodulator dopamine.

We hear about dopamine as a feel-good molecule, dopamine, dopamine, dopamine, dopamine hits, but dopamine's main role in the brain and body is to drive motivation, craving, and pursuit.

It is not the molecule of pleasure.

It is the molecule of drive.

It is life force.

Dopamine is actually the molecule from which adrenaline, epinephrine, is manufactured.

And you may notice you said we crave sun.

It also does make you feel good.

Here's why.

If you think about seasonally breeding animals, let's think about the Arctic fox.

Well, the Arctic fox in winter is white, but in the summertime has darker pellage.

It actually, there's a pathway going from sunlight to dopamine to melanin production in the skin and fur.

So animals that transition from light color to dark color, that's all mediated by dopamine.

Guess what else happens?

The gonads grow.

There are animals that I've worked on in the laboratory and that also in humans, it's now been shown in a beautiful study that people who get 20 to 30 minutes of light on their skin, this was a study done in Israel.

So they wear an appropriate amount of clothing, but they're sleeveless, no hat, no sunglasses.

They were told to go outside 20 to 30 minutes, three times a week, just in the sunshine.

Ideally, they wear shorts also.

They measure testosterone and estrogen in men and women.

Significant increases in both and all the associated things of increased passion, blah, blah, blah, blah.

That is what they measured in the study.

Why?

Well, it turns out that light to the eyes, but also light to the skin, the skin is an endocrine organ.

It's not just something to tattoo and hang earrings from and put clothing on.

It actually, there's a pathway involving a molecule called P53 and the keratinocytes are these skin cells that when sunlight, when UVB, ultraviolet blue light penetrates the skin, it actually triggers these keratinocytes to stimulate a pathway that releases dopamine in the brain and body.

So you feel better when you're getting light in your eyes and on your skin and you're increasing testosterone and epinephrine and dopamine increase.

That's why you feel good in the summer months.

People in Scandinavia know this, it's this kind of spring fever.

In the winter months, you want to go through every bit of effort to double or triple the amount of time that you're spending outside in the morning.

So instead of 10 minutes, make it 30 minutes.

We all are familiar with getting sleepy and falling asleep.

That's the parasympathetic nervous system taking over.

The longer we are awake, the longer the buildup of something called adenosine in the brain and body and adenosine turns on the parasympathetic nervous system, suppresses the sympathetic nervous system.

When we sleep, adenosine is pushed back down.

What is caffeine?

Caffeine effectively, through some chemical steps, blocks the effects of adenosine.

So here's a little trick.

I don't like the word hacks because hacks imply using something for a purpose it wasn't designed for.

Here we're talking about hardwired biology.

But if you wake up in the morning and you didn't sleep quite as much as you would have liked, and you're sleepy, that means you still have a buildup of adenosine in your system.

Let's say you immediately reach for caffeine.

Great.

You suppress the action of that adenosine and you will be more alert.

And guess what happens?

Then the caffeine wears off and the adenosine binds to the receptors with greater affinity and you have your afternoon crash.

So a practice that's very useful to people is to delay the intake of caffeine by 60 to 90 minutes after waking.

Allow the adenosine to be cleared out because it's not just cleared out in sleep, it's also cleared out in those kind of sleepy states of early morning.

So allow it to be cleared out.

The other thing that clears it out, exercise.

So when you get up in the morning, you're kind of sleepy, I don't want to do this, I don't want to do this, but you hydrate and train, you clear out the adenosine.

Now I like to drink caffeine before I train or during training.

I'm weak like that.

But for people to have an afternoon crash, this can have tremendous benefits.

And maybe start by pushing it out 15 minutes per day.

Most everyone that does this says, oh my goodness, I didn't understand why in the afternoon I'm crashing so hard.

This will really, really help.

So let me ask you this, I have a sense for you.

What time do you wake up typically?

Generally between, well, between 4.15 and 4.30.

Okay.

So for most people, it's going to be a little bit later, probably.

But for you, that means, so you're waking up, if it's because of an alarm, it's because of an alarm.

But if that's your natural wake up time now without an alarm, that means that your temperature is starting to rise at that time.

That's why you wake up.

That temperature increase triggers that cortisol release.

Now, and that's why some people wake up right before their alarm clock.

It's this cortisol pulse.

Okay.

And two hours before that, so for you, approximately 2.30 in the morning is what we call your temperature minimum.

It's when your temperature is lowest that it's ever going to be in the 24-hour cycle.

So the way it works is you wake up because of an increase in core body temperature.

That increase in core body temperature triggers that increase in cortisol.

And by viewing light at that time, you entrain, you ensure that it happens at the same time the next day.

The clocks of your body are matched to this cortisol pulse.

So viewing bright light in the morning anchors it, when we say entrained, it tells through a circuit that involves cells in the eye and cells in the hypothalamus, which then talk to the rest of the cells of the body through a signal, a peptide that's released.

Make sure that the temperature starts rising, goes up, up, up, up, up, up, and sometime around two or three in the afternoon, you're going to hit your temperature maximum.

You might feel a little sleepy at that time, but that's actually the time in which all your systems are kind of revving at the maximum capacity.

And then it's going to start to drop and start to drop, drop, drop.

Now that drop in temperature eventually will be a full one to three degrees below what your temperature maximum.

And that's when you're going to get sleepy and fall asleep.

This is why it's important to keep the room cool at night to fall asleep.

The goal here is to increase body temperature in order to be awake and to decrease body temperature in order to be asleep.

If we stay with those themes, a lot of this will just fall into bins.

Exercising will increase body temperature.

Somewhat paradoxically, getting into a cold shower or cold water, everyone says, well, it must make you cold, right?

Well, if you stay in there a long time, you become hypothermic, right?

But let's remember the thermostat example.

You have a little area in your brain called the medial preoptic area.

And if you make the surface of your body cold, guess what happens?

Core body temperature goes up.

So if you're going to do ice baths or cold showers, you can do, I would say, do them some time better than not at all.

There's a beautiful paper published in the European Journal of Physiology in the year 2000, which took people and had them sit, they actually had them on lawn chairs in water, a pool.

It was a great way to run an experiment.

I would say people ask about cold showers.

There are not a lot of experiments on cold showers, because think about it's very hard to control.

Is everyone under the shower the same way, et cetera?

You put someone up in water up to their neck, you know what you're doing.

So it's experimental rigor that drives that.

But they had people get into reasonably cool water, 60 degrees Fahrenheit.

So it's not that cold, but they had them stay in for an hour.

Or they've had people get into very cold water, something like 40 degrees for just 20 seconds.

Now, here's what's really interesting.

That shock that you referred to is adrenaline, also called epinephrine.

And it is released from the adrenals, obviously, but also from a site in the brain called locus ceruleus, a little area of the brainstem that then sprinklers the rest of the brain with epinephrine and wakes up the rest of the brain.

So that shock occurs in the brain and the body.