当这种情况发生时，你的孩子的大脑处于睡眠状态。

When it happens, your child's mind is asleep.

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根据一项关于睡觉的鸭子的新研究来看，半睡半醒的鸟儿——大脑的一个半球处于警觉状态，另一个半球处于睡眠状态——控制着大脑的哪一边保持清醒。

Birds that are literally half asleep—with one brain hemisphere alert and the other sleeping—control which side of the brain remains awake, according to a new study of sleeping ducks.

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换句话说，就是人脑能同时处于睡眠和觉醒。

In other words, the human brain can be awake and asleep at the same time.

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From the mere fact that they can't picture it from the inside, it doesn't follow that nobody believes they're ever in dreamless sleep.

仅从他们无法设身处地,想象这种情况这个事实，是无法得出没有人相信,自己能处于无梦睡眠的结论的。

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