他酣然入睡，一夜无梦。

He fell into a deep dreamless sleep.

《柯林斯英汉双解大词典》

我能够轻而易举地想象无梦的睡眠。

I can picture being in dreamless sleep quite easily.

youdao

没有感觉可以形容无梦的睡眠。

There is nothing that it's like to be in dreamless sleep.

youdao

But think of the various periods during the night in which you are in a deep, deep dreamless sleep.

但请设想你处在这样的夜晚,你处于熟睡，安枕无梦。

耶鲁公开课 - 死亡课程节选

From the mere fact that they can't picture it from the inside, it doesn't follow that nobody believes they're ever in dreamless sleep.

仅从他们无法设身处地,想象这种情况这个事实，是无法得出没有人相信,自己能处于无梦睡眠的结论的。

耶鲁公开课 - 死亡课程节选

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