Insomnia is composed of three aspects: sleep quality, sleep duration, and unsatisfactory sleep efficiency. Insomnia in the second half of the night is mostly early awakening, sleep maintenance difficulties, common causes are as follows: 1, family history: the incidence of insomnia in those with a family history of insomnia is three times higher than those without a family history; 2, age and gender characteristics: as we grow older, the number of awakenings and waking time after going to sleep increases, and the continuity of sleep gradually decreases; 3, lifestyle habits: pillow discomfort or drinking a lot of energy drinks, too full or too hungry, daytime bedtime 4.Misconceptions: excessive worry about lack of sleep time, repeated consideration of the consequences of insomnia leads to emotional tension and difficulty in maintaining sleep; 5.Self-characteristic personality: such as perfectionism, introverted personality or people with anxiety characteristics; 6.Stress and life events: change of sleep environment or some unexpected events induce thought fluctuations, work intensity or life stress, etc. High, etc. Therefore, the causes of insomnia include changes in various factors such as physiological, psychological and environmental factors, as well as neurological, mental and somatic disorders. Long-term insomnia can also induce hypertension, coronary heart disease, cerebrovascular disease and other diseases, which should be treated early.