You start off with a transition period when you're falling asleep. We call that stage I.

一开始是过渡期,你开始进入睡眠状态，这是第一阶段。

耶鲁公开课 - 心理学导论课程节选

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

Then REM sleep emerges, rapid eye movement sleep.

这时就进入REM快速眼动睡眠。

耶鲁公开课 - 心理学导论课程节选

First,we'll put you to sleep when we do all this procedure.

首先会让你进入睡眠状态。

耶鲁公开课 - 死亡课程节选

Of course you believe that at times you're in dreamless sleep.

你当然是相信有时你能进入无梦睡眠的。

耶鲁公开课 - 死亡课程节选