《论衡·卷二十·论死篇》
现在假设做梦时人的精神确实离开了人体，人梦见杀伤人以及自己又被人杀伤，第二天察看别人的身体，察看自己的身体，并没有兵刃创伤的迹象。
今其审行，人梦杀伤人，梦杀伤人，若为人所复杀，明日视彼之身，察己之体，无兵刃创伤之验。
Now suppose that when dreaming the human spirit does indeed leave the human body, the person dreams of killing and injuring people and of being killed and injured himself, and on the next day examines the bodies of others and examines his own body, there are no signs of injuries from weapons.