Insomnia refers to a condition in which the quality and quantity of sleep cannot be satisfied for a sustained period of time. There are usually two classifications of insomnia, according to the duration of the disease: 1. transient insomnia, which refers to less than 1 week, such as insomnia due to recent examinations, can be self-limiting and does not require medical treatment; 2. short-term insomnia, which refers to insomnia within 1-4 weeks; 3. long-term insomnia, which is insomnia of >4 weeks. Classification by etiology: 1. primary insomnia for which no cause can be found; 2. secondary insomnia, such as secondary to somatic diseases, drug abuse, alcohol dependence. In the diagnosis of insomnia, the following basic elements are included: 1) difficulty in falling asleep; 2) difficulty in maintaining, waking up easily in the middle and early waking; 3) duration of sleep, insomnia occurs more than 3 times a week and has lasted for at least 3 months; 4) insomnia has affected the next day’s social behavior; 5) excessive worry about the psychological state of insomnia has also affected the usual Daily life.