It says they should be placed on a separate sleep surface from their parents,without blankets, pillows or other soft bedding.

VOA: special.2009.08.26

Well, should we conclude, therefore, so nobody really believes that they're ever in dreamless sleep?

那么我们就应该得出结论，没有人真正相信,他们可以进入无梦的睡眠么？

耶鲁公开课 - 死亡课程节选

We banned that drug and I haven't heard anybody saying that that was a wrong decision, that we should allow pregnant women who want to sleep better to take a drug that will mean their children are born without limbs.

我们禁止了这种药物的使用，但我们从未听说,有人认为这是个错误的决定，也从未有人说，我们应该允许,失眠的孕妇使用这种药品,即使她们的孩子可能从出生就没有四肢。

普林斯顿公开课 - 人性课程节选

The experts advise that people should plan to exercise,eat and sleep at the same times each day.

VOA: special.2010.03.30

Stanford sleep researcher Cheri Mah says sleep should be part of an athlete's training program.

VOA: special.2010.06.09

Adults should try to get seven to eight hours of sleep a night.

VOA: special.2010.06.09

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

VOA: special.2009.06.02