Perhaps keeping one side of the brain awake allows a sleeping animal to surface occasionally to avoid drowning.

也许保持一侧大脑清醒可以让睡眠中的动物偶尔浮出水面，避免溺水。

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They found that one half of the brain "remains more awake" than the other half when people are trying to sleep in a new place.

他们发现，当人们试图在一个新的地方睡觉时，大脑的一半比另一半“更清醒”。

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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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Your brain is active as if you were awake, your EEGs are similar to waking, paralyzed except for the eyes, oh, men get erections and you have dreams.

大脑处于活跃状态，像清醒时一样，脑电图也和清醒时相似，但除了眼部，全身都不会动，男人会勃起，梦境会出现。

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This might not seem a big deal, but it is the first time science has proved what was hitherto mere speculation: that the brain, when dreaming, behaves like the brain when awake.

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Patients in a vegetative state are awake, not in a coma, but have no awareness because of severe brain damage.

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But when smoked, nicotine causes neurons in the brain to release a soup of chemicals that make the smoker happier, smarter and more awake.

FORBES: Tobacco-Free