Insomnia is the most common type of clinical sleep disorder. Long-term insomnia can have a serious negative impact on normal life and work, and can even lead to malignant accidents. I. Definition and classification of insomnia Insomnia usually refers to a subjective experience that patients are not satisfied with the time and/or quality of sleep and affects daytime social function. Insomnia is characterized by difficulty in sleeping (more than 30 min to fall asleep), sleep maintenance disorder (≥2 awakenings throughout the night), early awakening, decreased sleep quality and reduced total sleep time (usually less than 6 h), accompanied by daytime dysfunction. Insomnia is classified according to its duration: acute insomnia (duration <1 month); subacute insomnia (duration ≥1 month, <6 months) and chronic insomnia (duration ≥6 months). Insomnia is divided into two categories: primary and secondary, according to the etiology of the town. Primary insomnia usually lacks a clear cause or remains after excluding the possible causes of insomnia, and mainly includes three types of psychophysiological insomnia, idiopathic insomnia and subjective insomnia. The diagnosis of insomnia must meet the following conditions: 1. The presence of one of the following symptoms: difficulty falling asleep, sleep maintenance disorder, early awakening, decreased sleep quality or no sense of recovery after waking up in the morning of daily sleep. 2. The above symptoms occur despite the availability of sleep and an environment suitable for sleep. 3. The patient complains of at least one of the following sleep-related impairments in daytime functioning: (1) fatigue or general malaise; (2) decreased attention, attention maintenance, or memory; (3) decreased ability to learn, work, and/or socialize; (4) mood swings or irritability; (5) daytime sleepiness; (6) decreased interest or energy; (7) increased tendency to make mistakes at work or while driving; (8) nervousness, headache, dizziness, or other symptoms related to sleep. headache, dizziness, or other physical symptoms associated with sleep deprivation; (9) excessive concern about sleep.