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