When you're really tired sleep is what you want to do like when you're really hungry you want to eat.

你累了，就会想睡觉,正如你饿了想吃东西一样。

耶鲁公开课 - 心理学导论课程节选

So, if you're woken up during slow-wave sleep you're going to be thinking "Did I take the-- yes, while I was dreaming I was thinking about the garbage," but if you're woken up during REM, "But a monkey was eating my grandmother," and that sort of thing. So, there is a distinction.

在慢波睡眠中醒过来,你会想“我倒垃圾了吗？,原来我睡觉是想着倒垃圾了”,但如果你在REM睡眠中醒过来，“天啊，有只猴子在吃我奶奶”,这就是真正的梦和半睡半醒的想法之间的区别。

耶鲁公开课 - 心理学导论课程节选