Dreams are a common physiological phenomenon in human beings, and it is normal for normal people to dream or to feel dreamy during sleep, as long as it does not affect their daytime life and work. The effect of dreams on health can be said to be both beneficial and detrimental. German neurologist Professor Kornberg believes that dreaming can exercise the brain function. He believes that only some of the brain cells are in a state of activity, even during intense mental work, while others are in a dormant state. If these dormant brain cells are not used for a long time, they are bound to fade away by themselves. Dormant brain cells in order to prevent this phenomenon of decline, only with the help of human sleep dreaming to exercise their own and rehearse their functions, so as to achieve self-improvement, will not decline. Therefore, there is no need to make a fuss about dreaming. A newborn baby may not dream in the first few days because he lacks external impressions and has no objective source of dreaming, or because the development of its cerebral cortex cells has not yet reached the level of retaining impressions of external things. However, infants over half an age already laugh, vocalize and cry during sleep, which may be a sign of dreaming. The content of dreams varies according to the age, and it is also related to the richness of knowledge, experience and experience. A little girl dreams of a doll, a scientist dreams of the success of an experiment, a mother sees her distant son or daughter in her dream, and so on. The same stimulus can cause different dreams. Dreams are related to past experiences, and to one’s own situation. New things to do about 75 ℅ of the dream, the dream of the past distant things about 15 ℅, and about 10 ℅ of things not related to the past. Dreams have a lot of content, can be involved in all aspects of our lives, both good and bad. Dream is just a dream, is the brain cortex in the unconscious state of a thinking generalization, does not represent a person’s thoughts and morals, so that there is no need to be afraid of some dreams. Of course, if dreaming too much, affecting the normal sleep, after waking up, the mind drowsy, mental trance, the whole body tired and weak, can not come out of the dream state, it is pathological, detrimental to health. To sum up, excessive dreaming is a clinical symptom influenced by a variety of complex factors. Long-term excessive dreaming will affect brain function, and dreaming is a subconscious expression of emotion, most of which can be treated by self-interpretation and release of repression, and you can also have healthy sleep through self-therapy.