Usually, there are several cases of dreaming: First, the most common factor is plant nerve dysfunction, dysfunction of the nervous system, which leads to poor quality of rest and sleep, when the deep sleep time is shortened and the light sleep phase is prolonged, and dreaming will occur in the light sleep phase. Second, emotional disorders, emotional disorders or changes in the neurohumoral endocrine axis may also lead to unstable sleep and dreaming. Third, lack of oxygen in the brain, such as pulmonary hypertension, chronic obstructive pulmonary disease, because of lung insufficiency, so there will be sleep apnea syndrome, when the lack of oxygen flow will appear sleep sleep talk, sleep talk, sleep talking, etc..