Last August,a study in the journal Sleep Medicine said children who go to bed after nine o'clock took longer to fall asleep and slept less.

VOA: special.2010.06.09

00 Now I say while i is less than or equal to 100, I write my code, I sleep for a second.

现在我指明当i小于等于，我写下我的代码，我休眠一分钟。

哈佛公开课 - 计算机科学课程节选

It said they were getting far less sleep than they should.

VOA: special.2009.06.02

The mice with the mutation needed less sleep than normal mice.

VOA: special.2009.08.26

People who have this mutation need less sleep than others.

VOA: special.2009.08.26