It is normal to talk in your sleep occasionally, but talking in your sleep frequently may affect the quality of sleep and cause sleep disorders. The human sleep process includes two phases: non-REM sleep and REM sleep, and non-REM sleep is divided into four phases: sleep onset, light sleep, moderate sleep and deep sleep. During deep sleep, the normal cerebral cortex tends to be inhibited, but some cells are still relatively excited, so if a connection is established with the nerve cells that control speech, the phenomenon of talking in dreams will occur. There are several reasons for this, first of all, psychological factors, if the heart is always thinking about a thing or work pressure, resulting in mental tension, emotional instability, night will be dreaming, and with the daytime thinking about things related to the content. Secondly, physiological factors, if you are too full or too hungry before going to bed, drinking a lot of coffee, tea, a lot of sports and activities before going to bed, in a chaotic and bright environment, etc., will cause the brain to be in a state of hyperactivity, late to stay down. Thirdly, somatic factors, some people talk in their sleep is related to neurasthenia, the dream itself is a subconscious reaction, in reality some impulses and instincts will be repressed, and in the dream will be gradually released. Therefore, dream talking is a normal physiological phenomenon influenced by psychological, physiological and somatic factors.