It is more difficult to relax and have a peaceful sleep when you are very excited.

当你非常兴奋的时候，是很难放松并睡一个安稳觉的。

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The brain is as active during REM (rapid eye movement) sleep when most vivid dreams occur as it is when fully awake, says Dr. Eric Nofzinger at the University of Pittsburgh.

匹兹堡大学的艾瑞克·诺夫辛格博士说，大脑在快速眼动睡眠期和完全清醒时一样活跃，大多数最生动的梦都发生在这个时候。

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He had just drifted off to sleep when the phone rang.

他刚睡着电话铃就响了。

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A new mother,for example, quickly learns to try to sleep when her baby is quiet, even in the middle of the day.

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First,we'll put you to sleep when we do all this procedure.

首先会让你进入睡眠状态。

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When you're really tired sleep is what you want to do like when you're really hungry you want to eat.

你累了，就会想睡觉,正如你饿了想吃东西一样。

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And here they are, led by the coach who once grabbed sleep when he could.

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Everyone since has simply gone to sleep when people complain about the further cuts.

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Don't assume they will suddenly get more energy or need less sleep when they're on vacation.

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