This explains why we sleep at all and this probably explains why we sleep at night.
这个解释了我们为什么要睡觉，这个解释了我们为什么在晚上睡觉。
Over the years, scientists have come up with a lot of ideas about why we sleep.
关于我们为什么要睡觉，多年来，科学家提出了很多想法。
This seemed a fair explanation of why we sleep at night, and why we snooze on rainy Sunday afternoons.
这看起来好像是一个为什么我们夜间睡觉，或下雨的星期日下午打盹的合理解释。
One night, my sister wanted to sleep in the room to see why he woke up screaming every time we put him in his crib fast asleep.
一天，我姐姐打算睡在那个房间，想知道为什么每次我们把他放在婴儿床上熟睡时，他就会尖叫着醒来。
Why does the rustle of sheets wake us up on some nights, but we sleep through the sound of our alarm clocks going off on others?
为什么我们在某些夜晚会被床单发出的沙沙声吵醒，却没有理会那些吵醒别人的闹钟声而睡过头呢？
We didn't ask 'Why didn't you get enough rest or sleep?' said Lela McKnight-Eily, an epidemiologist for the Centers for Disease Control and Prevention who led the study.
负责此项研究的美国疾病防控中心的流行病学家莱拉•麦克耐特-艾莉说：“我们并没有提出‘为什么你没有得到足够的休息或者睡眠？’ 这一问题。”
The findings may explain why parents instinctively rock babies to sleep, and why we find it so easy to nod off when slumped in a rocking chair, they add.
他们还说，这项发现或许可以解释父母本能的摇晃婴儿睡觉的原因，也可以解释为何我们一躺在摇椅上就会打盹。
Why do we sleep and why don't we — why aren't we always awake?
我们为什么会睡觉，我们为什么不是一直醒着？
At first we couldn't figure out why they made so much noise when it was time for them to go to sleep, but it was because someone had accidentally taken the toy from their basket.
起先我们不理解为什么睡觉时它们喜欢制造一些噪音出来，后来才明白原来是有人从它们的篮子里拿走了这个玩具。
That could explain why our sleep-deprived selves are so cognitively challenged: We are, if not precisely half-asleep, partially asleep.
这解释了为什么我们缺少睡眠时，认知能力会下降：这时的我们即使不是半睡状态，也是部分睡眠。
Sleep and dreams have interested people for centuries. Scientists are learning more about sleep, but they still know very little about why we dream.
几个世纪以来，睡觉和做梦都让人着迷。科学家对于睡觉了解了很多，但是他们仍然不清楚为什么人会做梦。
Why do we not doubt whether our thoughts and actions are not another sort of dreaming, and our waking a certain kind of sleep?
为什么我们不怀疑我们的想法和行动只不过是另一种梦？以及，我们的清醒只是某种形式的睡觉？
Why do we close our eyes when we sleep, when we cry, when we imagine, when we kiss? Because the most beautiful thing in the world is unseen.
为什么我们闭上眼睛，当我们睡觉，当我们哭泣，当我们想像，当我们亲吻？因为，世界上最美丽的东西是看不见的。
One theory for why we need sleep is that our brains use the opportunity to consolidate memories from that day.
关于为什么人类需要睡眠的一个理论是，我们的大脑利用这个机会整合一天的记忆。
A gene that controls how long we sleep has been discovered by scientists explaining why some people have their own internal alarm clock.
科学家们发现了一种能控制人睡眠时间长短的基因，这解释了为什么一些人拥有自己私人的生物钟。
"We need an off-line period, when we are not exposed to the environment, to take synapses down, " Cirelli say. "We believe that's why humans and all living organisms sleep.
“我们需要‘下线’一段时间，远离环境刺激，好让我们的突触休息下，”Cirelli说，“我们相信这就是人类及其他有生命的有机体需要睡眠的原因。
We are giving God 24 hours a day, to go to work 8 hours, 7 hours sleep, three meals 2 hours, why spend 7 hours, in any case should have 1 hour to learn.
上帝赋于我们每日24小时，上班8小时，睡觉7小时，三餐饭2小时，莫名其妙消磨7小时，无论如何应有1小时来学习。
We want to know how best to fall asleep during a heatwave. We want to know why we wake up when we do. And of course we want to know how best to get our children to sleep.
我们想知道在酷热环境下如何最快进入睡眠，想知道为什么会突然醒来，还想知道哄孩子睡觉的最好方式。
Sleep is one of the richest topics in science today: why we need it, why it can be hard to get, and how that affects everything from our athletic performance to our income.
如今睡眠问题在科学研究里成了一个最丰富的课题：为什么我们需要睡眠，为什么我们睡不着？
AND THAT'S WHY…In our first 20 years, we eat, sleep, play, enjoy the best and do nothing more.
这就是为什么……头20年，我们吃喝玩乐，尽情享受，无所事事。
At first we couldntfigure out why they made so much noise when it was time for them togo to sleep, but it was because someone had accidentally taken thetoy from their basket.
起先我们不理解为什麽睡觉时它们喜欢制造一些噪音出来，后来才明白原来是有人从它们的篮子里拿走了这个玩具。
And that's why in our first 20 years, we eat, sleep, play, enjoy the best and do nothing much. For the next 30 years, we work all day long, suffer and get to support the family.
人生的头20年里，我们可以吃喝玩乐，开开心心地过日子，随后的30年里，我们却要整天不停地工作，以便能养家糊口。
After nurturing our babies and giving them the best possible start in life why, when they are ready for their first sleep support, do we give them any old pillow to sleep on?
您已经开始准备为宝宝准备第一款枕头了？在培育我们的宝宝前为什么不给他们最好的开始呢？还在使用那些老款枕头么？
After nurturing our babies and giving them the best possible start in life why, when they are ready for their first sleep support, do we give them any old pillow to sleep on?
您已经开始准备为宝宝准备第一款枕头了？在培育我们的宝宝前为什么不给他们最好的开始呢？还在使用那些老款枕头么？
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