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

But really, the computer's just so fast I'm drawing the same string with just a slightly different number again and again after going to sleep one second at a time.

但是真实地，这个计算机到现在为止,我一次又一次用稍微不同的数字,绘画了相同的字符串,在睡眠1秒钟之后。

哈佛公开课 - 计算机科学课程节选

We are living in very unusual times and I am sure that Ben Bernanke and other central bank presidents are losing sleep right now because this is a time to challenge monetary policy makers.

我们现在正生活在一个非常特殊的时期,并且我很肯定本？伯南克,和其他中央银行行长们,正在日夜担忧，因为,现如今是一个挑战货币政策制定者的时代。

耶鲁公开课 - 金融市场课程节选

The next time you think about going without sleep, consider this: Laboratory animals that are kept awake for long periods of time ...die.

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

A new study found better results in four-year-olds who go to bed around the same time every night and sleep at least eleven hours.

VOA: special.2010.06.09

He says he realized it was time to find a separate space where the poets could gather and he could still get some sleep.

VOA: special.2009.04.27

And to prepare himself, he went without sleep for long periods of time.

VOA: special.2009.03.18

Sometimes people sleep for a short time during the day.

VOA: special.2009.09.27