There are many things that can happen during human sleep, some people may wake up, some people may talk, some people may even sing or move down to the floor, if it happens infrequently it is normal. The phenomenon of talking during sleep is also known as somnambulism, and many people have experienced it without panic. Human sleep can be divided into non-REM sleep and REM sleep, the two phases of intermittent intervals, about every 90-100 minutes for a cycle, non-REM sleep can be divided into four periods of sleep, light sleep, moderate sleep and deep sleep. As the sleep deepens, the activity of human organs gradually decreases, and the cerebral cortex starts to tend to the inhibitory state, but if some cells are still in the excited state, they start to dream, and at this time, they establish contact with the nerve cells that control speech, and 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”, if you are always thinking about a thing or work pressure, resulting in mental tension and emotional instability, you will talk in your sleep; 2, physiological factors: too full or too hungry before going to bed, drinking coffee, tea or functional drinks, a lot of exercise and activities before going to bed, being in a chaotic and bright light. Activity, in the chaos and light environment, etc. caused by the brain in a state of hyperactivity; 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, and thus gradually released in the dream. In short, dream talking is a normal phenomenon, want to alleviate the occurrence of this phenomenon, first of all, to solve the psychological problems, while paying attention to rest, develop good sleep habits, will soon gradually improve.