Name: 「質の良い睡眠」って何？5段階のレベルで説明 | 5 Levels | WIRED Japan
Uploaded: 2025-04-12T09:50:10.000Z
Duration: 23 min 40 s
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My name's Eric Prather, and I'm a sleep scientist at UCSF.

To-infinitive

I study the causes and consequences of insufficient sleep, and I also carry out interventions to improve sleep among people with insomnia.

Today, I've been challenged to explain the topic of sleep at five different levels.

Everybody knows a little bit about what is happening when they sleep, but I think they'll be surprised that there's a lot of science in there.

Well, that's awesome, because we're gonna be talking about science today.

And you know what we're gonna be talking about?

Mine too, because I get to spend all day studying it.

Because you know what sleep does for you?

It rushes your body like an electric car.

It kind of is like recharging your battery, right?

And sleep is so critical for so many parts of our body and our mind, right?

It plays a really important way that we learn, and it helps us kind of recover from the day before.

It affects our immune system and our metabolism.

All of these things that we need to kind of be healthy.

So today, we're gonna talk about some animals and how they sleep.

And so what's really cool about this is that giraffes need to sleep like everybody else.

And so the way that it does is it kind of slumps over, and it gets down on its legs, and it kind of becomes this ball.

But what's crazy about the whole thing is they only sleep for like 30 minutes a day. 30 minutes.

Because it can't waste any more time because it can't be vulnerable for any longer.

It can get eaten by lions and that kind of thing.

It has kind of evolved in a way that it can still survive and still get all the restoration it needs under such a short period of time.

I mean, how does it like recharge like humans?

So we think it works the same way, but maybe just like more efficiently.

And so we're still really learning about how this works.

Sleep science itself is kind of a new field.

I had a sleepover on Saturday, and I didn't sleep at all.

Do you think you were a little crankier than usual?

That's actually really interesting because what happens is humans and everything needs to sleep eventually.

And so you can't stay up indefinitely, right?

What do you think happens if you don't sleep?

It affects what you can do in your daily life.

So now I want to tell you about another animal and how they sleep, okay?

In the area that they live, they need to stay cool, right?

And so they spend a lot of time in the water.

And so then as a consequence, they need to sleep in the water.

What they do is while they're sleeping, they actually float back up to the surface and breathe without waking up.

They're able to go about their whole sleep cycles, but still able to breathe because their body has adapted in a way that they can still get the oxygen that they need.

So now I want to talk about our last animal.

And I think this one is probably the most amazing of all.

So dolphins, kind of like hippos, have to sleep in the water, okay?

They have to go up to the surface and breathe, right?

And for an animal like that, it can get eaten.

It needs to figure out a way that it can sleep, but also still survive, right?

So half of their brain goes to sleep, and the other half stays awake so that they can continue to breathe and swim.

And they do it in this four hours at a time.

So their right part of their brain sleeps.

They're able to go up to the surface and breathe.

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「質の良い睡眠」って何？5段階のレベルで説明 | 5 Levels | WIRED Japan

cognitive

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rhythm

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