有些病可以导致多梦,如神经衰弱症。但是,绝大多数的梦是属于正常生理现象,有利于身体的健康。一般成人在8个小时的睡眠中,大约2～4个小时处于半睡眠状态,把白天活动在大脑皮层所遗留下来的印象,以及睡眠中来自体内和体外的刺激传递到大脑皮层,就会做梦。最近,日本研究人员发现,人在睡眠时会产生两种催眠肽,一种是有梦催眠 Some diseases can lead to more dreams, such as neurasthenia. However, the vast majority of dreams belong to normal physiological phenomena, which are good for the health of the body. The average adult sleeps for about 2 to 4 hours in about 8 hours of sleep, dreaming of the daytime activities in the cerebral cortex, and the in vivo and in vitro stimuli delivered during sleep to the cerebral cortex . Recently, Japanese researchers found that people sleep when they produce two hypnotic peptides, one is a dream hypnosis