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

So, we have no problem understanding a movie where somebody goes to sleep as a teenager and wakes up as Jennifer Garner, as an older person.

我们完全能够看懂电影中,一个少女睡去,一觉醒来却变成了詹妮弗·加纳,一个成年人

耶鲁公开课 - 心理学导论课程节选

And she says to me, " "You know, I'd better have a decaf because it's kind of late and I want to be able to sleep."

这时，她对我说，“我最好喝一杯无咖啡因的咖啡,因为现在有点晚了，我怕失眠“

耶鲁公开课 - 心理学导论课程节选

And if they do not have a traditional coffin to sleep in during the day, they can find other answers, such as using a car.

VOA: special.2010.01.20

"I actually have them sign a form saying you will be running, you will skip meals, you will not get sleep."

VOA: standard.2010.02.26