Even without morning light, their circadian rhythms told them when dawn should be breaking.

即使没有晨光，它们的生物钟也会告诉它们什么时候天亮。

But not everyone's circadian rhythm is the same.

但每个人的昼夜节不一定一样的。

The cells, called ipRGCs, are responsible for regulating circadian rhythms.

这些叫做ipRGCs的细胞负责调节昼夜节。

If you'll remember earlier in the video, I talked about how the circadian rhythm is, for the most part, endogenously, I think that's how you pronounce it.

视频前面有，关于生物钟的问题，多数情况下内源代谢，我觉得这么发音。

And social jet lag is taking its toll on the night owls of the world because even if you get the recommended amount of sleep, knocking your circadian rhythm out of wack has consequences.

社会时差发生在世界上的夜猫子们身上，因为即使得到了充足的睡眠量，从昼夜节中被唤醒也会产生相的后果。

Sleep is regulated by your circadian rhythm, or body clock, located in the brain.

睡眠由脑内的昼夜节或生理时钟所管理。

Blind people who have some light perception are able to synchronise their circadian rhythms to the light-dark cycle.

一些具有光感的盲人可以依据昼夜循环来同步他们的昼夜节。

Your circadian rhythm, which governs your sleep and wake cycle, is the best example – but it also applies on the smaller scale as well.

控制睡眠和醒来周期的昼夜节好的例子——但它也适用于较小的方面。

Efforts to alter your circadian rhythm are likely to end in sleepy frustration.

试图改变你的昼夜节可能会以困倦和沮丧告终。

And your circadian rhythm can get sort of messed up very quickly.

昼夜节很容易被打乱。

This is the first time that the circadian clock within individual cells has been shown to determine how effectively they respond to injuries, he said.

他说，“这项研究首次显示出，个体细胞内的昼夜节能够对伤口作出有效反映”。

Giles Duffield, a biologist at the University of Notre Dame, who studies circadian rhythms.

圣母大学研究昼夜节的生物学家贾尔斯·达菲尔德说到。

That's because light suppresses melatonin, a hormone that plays an important role in circadian rhythm.

这因为光抑制褪黑激素，褪黑激素在昼夜节中起着重要作用。

Their light at night can affect our internal clocks, or circadian rhythm.

它们在夜间发出的光会影响我们的生物钟，或者说昼夜节。

Sofia Axelrod studies circadian rhythms at Rockefeller University in New York.

索菲亚·阿克塞尔罗德在纽约洛克菲勒大学研究昼夜节。

It may be most useful for people who have abnormal or disrupted circadian rhythms — like people with jet-lag, night shifts, or a condition called delayed sleep phase syndrome, which is when your biological clock is perpetually several hours behind.

它可能对昼夜节异常或紊乱的人有用，比如时差、夜班或被称为睡眠阶段延迟综合症的人，这种综合症指你的生物钟永远落后几个小时。

On Earth, our bodies respond through circadian rhythms to the Sun rising and setting to help us sleep, but astronauts on board the International Space Station see 16 sunsets and sunrises every day.

在地球上，我们的身体通昼夜节对太阳的升起和落下做出反，帮助我们入睡，但国际空间站上的宇航员每天都能看到 16 次日落和日出。

Biology — circadian rhythms — likely also play a part; people tend to be at their most alert at the start of the day, and would therefore be satisfied with a meal choice that they don't have to think about too much.

生物学——昼夜节——也可能发挥作用；人们往往在一天开始时处于警觉的状态，因此会对他们不必考虑太多的餐食选择感到满意。

Some doctors even say the clock change isn't healthy and can cause headaches in some of us by affecting the hypothalamus in the brain, The part that manages our circadian rhythm.

有些医生甚至说，时钟变化不利于人体健康，这会影响大脑中的下丘脑，从而导致某些人头痛。这控制我们昼夜节的部分。

In the fall of 2015, Seattle public schools announced that it would change the school starting time from 7: 50 AM to 8: 45 - to adapt to the circadian rhythm of teenagers.

2015年秋季，西雅图公立学校宣布将把上课时间从早上7: 50改为8: 45，以适青少年的昼夜节。