Scientists have discovered remarkable new evidence showing how the body rebuilds itself while we sleep.

科学家们已经发现了非同寻常的新证据，证明睡眠时我们的身体如何自行恢复。

《柯林斯英汉双解大词典》

Our brains seem to know this and practice responding to threatening situations while we sleep.

我们的大脑似乎对此很清楚，在我们进入睡眠时不断练习对危急情况的反应。

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What is important is that every day we receive a present, wrapped especially for us while we sleep: THE NEXT day.

重要的是，每天在我们睡觉的时候都会收到一个特别为我们而包装的礼物：新的一天。

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Space vehicles for humans must be made safe, while we can risk a bunch of robots without losing sleep.

CNN: Mars can wait. Oceans can't