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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"We could barely sleep while waiting for the results of the summit meeting, as we were full of such high hope and expectations that the release and safe return of our family members abducted there is up to the meeting of two leaders, " said Cha Sung-min, a spokesman for relatives of the hostages, at their Saemmul Community Church in Bundang, south of Seoul.

NPR: Taliban Renew Threat Against South Koreans

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