During your exam period, you want your brain to work at its very best, so build in relaxation time before bed, avoid late night revision sessions and try to go to bed early so you get enough sleep.

在考试期间，你想让你的大脑处于最佳工作状态，所以在睡觉前安排放松时间，避免深夜复习，尽量早点睡觉，这样你就能得到足够的睡眠。

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Very early risers and longtime night owls have a hard time ever changing, says David F. Dinges, chief of sleep and chronobiology at the University of Pennsylvania's Perelman School of Medicine.

宾夕法尼亚佩雷尔曼医学院睡眠和时间生物学主任大卫·丁格斯说，起得很早的人和长时间的夜猫子很难突然改变。

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Therefore, it is very important that you get at least eight hours of sleep every night that you complete your workout routine.

因此，在完成锻炼计划后，每晚保证至少8个小时的睡眠，是非常重要的。

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I was very tired because I did not sleep well last night.

VOA: special.2009.05.03

"I put the bedroom in because sometimes I don't sleep very well at night and sometimes I like to rest in the afternoon, " she says.

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This is a city where visitors who choose to stay in hotels in more bustling neighborhoods often don't get very much sleep, thanks to late-night revelers on motor scooters.

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For the study, very short sleep patterns were defined as less than five hours a night, short sleep was five to six hours a night, standard sleep was seven to eight hours, and long sleep was nine or more hours a night.

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