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》

While we sleep human growth hormone is released in spurts.

当我们睡觉的时候，人体的生长激素会被加速释放。

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'replay' is the hypothesis that the brain 'replays' the actions of the day while we sleep.

“回放”是对大脑会在睡觉时重复当日行动的假设。

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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