Insomnia is a subjective experience of insomniacs who are dissatisfied with sleep quality, sleep time and sleep efficiency, mainly manifested as difficulty in falling asleep, difficulty in waking up easily at night and falling asleep again, and less time in maintaining sleep. Common causes in order of commonness are as follows: 1. Self-personality: such as perfectionists, introverted personalities or people with anxiety traits are the most common causes of insomnia; 2. Genetic factors: the incidence of insomnia in people with a family history of insomnia is three times higher than in those without a family history; 3. Past medical history: certain physical and mental illnesses, commonly seen in patients with anxiety and depression, endocrine disorders, etc.: 4. Taking certain drugs : such as those taking hormones, stimulants and other drugs, are also more common. 5, stress and life events: a change in the sleep environment or around certain unexpected events leading to large fluctuations in mood, work intensity or life stress, etc., sudden insomnia is mostly related to this factor, some patients can not adjust the psychological will develop into long-term insomnia. 6, living habits problems: pillow discomfort or usually drink a lot of energy drinks, too full or too hungry, too long daytime bed rest or for some reasons lead to irregular work and rest in recent days, etc. 7, age and gender characteristics: in general, adult women have a gradually higher incidence of insomnia with the gradual increase in age, while there is no difference in gender distribution in childhood. Therefore, the causes of insomnia include changes in various factors such as physiological, psychological and environmental factors, as well as drugs, neuropsychiatric and somatic disorders and other aspects, which may be either individual factors or the result of multiple factors acting together.