Sleep accounts for about one-third of the time in the course of human life, and sleep-talking is the phenomenon of talking during sleep. Many people talk in their sleep, and it is normal for it to occur occasionally. About half of all children between the ages of 3 and 10 have this habit, probably because children’s nervous systems are not well developed. The proportion of adults who talk in their sleep is relatively low, and the percentage of adults who talk in their sleep frequently or even at night is about 5%. Dream-talking is more common in women than in men. Some other scientists believe that dream talking may be hereditary. However, frequent sleep talking may affect the quality of sleep and cause sleep disorders. The human sleep process alternates between non-REM sleep and REM sleep, with a cycle of about every 90-100 minutes, and non-REM sleep can be divided into four stages: sleep onset, light sleep, moderate sleep and deep sleep. As the sleep deepens, the activity of human organs gradually decreases, and the cerebral cortex starts to be in a state of inhibition, but if some cells are still in a state of excitement, they start to dream, and if they establish contact with the nerve cells that control speech, the phenomenon of dream talking will occur. The common reasons for dreaming are as follows: 1. Psychological factors: It is often said that “there are thoughts in the day and dreams in the night”, so if you are always thinking about something or working under pressure, which leads to mental tension and emotional instability, you will be dreaming; 2. Activity, in the chaos and light environment, etc. caused by the brain in a hyperactive state; 3, physical factors: some people talk in their sleep is related to neurasthenia, dreams are subconscious reactions, some impulses and instincts in reality will be repressed, but in the dream will be gradually released. In summary, dream talking is a normal physiological phenomenon influenced by psychological, physiological and somatic factors, generally no treatment is needed, but too much affects sleep, the next day feel fatigue and weakness should go to the hospital for examination and treatment. If you encounter someone around you talking in your sleep, don’t be afraid, if you find it, you can push him in time to stop him from continuing to talk in your sleep.