They include sleepiness, feeling sick or having bad dreams.

VOA: special.2009.04.07

The exceptions are lucid dreams where you choose what to dream about, and then possibly you could be immoral if you encourage bad habits of thought.

除了有意识的梦,在这种梦境里，你可以控制梦的内容，你可能会作恶,如果你纵容自己有这种作恶的思想的话。

耶鲁公开课 - 心理学导论课程节选

We do all sorts of things in dreams that are bad.

我们会在梦境里做各种各样的坏事。

耶鲁公开课 - 心理学导论课程节选

They're not bad, bad, they're not nightmares, but most dreams are from a scale of one to ten with five and a half in the middle they're on the negative side.

说它们不好，并不是说它们是噩梦，如果用1到10来评分,5。5为中间分值,大部份梦都是在5。5分以下。

耶鲁公开课 - 心理学导论课程节选

Most dreams are bad.

大部份梦都是不好的。

耶鲁公开课 - 心理学导论课程节选