Name: 【TED】Jessa Gamble: Our natural sleep cycle
Uploaded: 2017-01-31T09:44:14.000Z
Duration: 4 min 32 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

so that they would be ready for these changes in light.

and they're found in every known being that has two or more cells

if you take a horseshoe crab off the beach,

and you fly it all the way across the continent,

it will scramble up the floor of the cage

and it'll skitter down again right as the water is receding

until it kind of gradually loses the plot.

but there's nothing psychic or paranormal going on;

it's simply that these crabs have internal cycles

that correspond, usually, with what's going on around it.

And in humans, we call it the "body clock."

You can see this most clearly when you take away someone's watch

and you shut them into a bunker, deep underground,

kind of raving about their productive time in the hole.

So, no matter how atypical these subjects would have to be,

They get up just a little bit later every day -- say 15 minutes or so --

and they kind of drift all the way around the clock like this

And so, in this way we know that they are working on their own internal clocks,

rather than somehow sensing the day outside.

and it turns out that it's incredibly important in our lives.

and I think that it's the most underrated force on our behavior.

We evolved as a species near the equator,

But of course, we've spread to every corner of the globe

So the culture, the northern aboriginal culture,

In winter, there's a lot of sleeping going on;

So, what would our natural rhythm look like?

without any sort of artificial light at all,

And in-between, they have a couple of hours

the likes of which a modern day never sees.

report feeling so awake during the daytime,

but I believe we should understand the costs.

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【TED】Jessa Gamble: Our natural sleep cycle

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