Around the world, people changed sleep patterns thanks to the start or end of daylight savings time.

在世界各地，由于夏令时的开始或结束，人们改变了睡眠规律。

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In much of the animal world, night is the time set aside for sleep.

在许多动物世界里，夜晚是用来睡觉的。

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At the same time, from a recent study, many children have missed out on 4,500 hours of sleep by the time they are seven years old.

同时，最近一项研究显示，许多儿童到7岁时已少睡了4500个小时。

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At the time, scientists believed that a person at the top of the mountain would only have enough oxygen to sleep.

VOA: special.2010.06.30

Studies have shown that over time, most humans need eight to eight and a half hours of sleep for the best health.

VOA: special.2009.08.26

The amount of sleep was based on their reporting of a child's usual bedtime and wake time.

VOA: special.2010.06.09

The Sense of Smell Institute found that lavender increases the amount of time spent in the restful, restorative phase of sleep.

CNN: Sleep tips for the road-weary

On those days we brought the prams inside some of the time the children were sleeping, but most of their sleep they spent outdoors.

BBC: The babies who nap in sub-zero temperatures

Or to the God behind the God who moves the God who moves the player who moves the pieces and begins the round of dust and time and sleep and dying in your poem, Jorge.

NPR: Excerpt: 'Borges and the Eternal Orangutans'