Insomnia is both a symptom and a disease. It is divided into primary insomnia and secondary insomnia. Secondary insomnia accounts for 80-90% of the insomnia population, while primary insomnia accounts for only 15% of the insomnia population. The diagnosis of primary insomnia requires the following four conditions: 1. difficulty falling asleep, difficulty maintaining sleep, or no recovery after sleep; 2. difficulty falling asleep at least three times a week for at least one month; 3. sleep disorders that cause significant discomfort or interfere with daily life; 4. no neurological disorders, systemic diseases, use of psychotropic drugs or other medications that cause insomnia. 4. No neurological disorders, systemic diseases, use of psychotropic drugs or other medications that cause insomnia. Secondary insomnia: insomnia as a concomitant symptom of other diseases, which can be caused by: 1. chronic physical diseases: such as pain, heart failure, chronic lung disease, arthritis, chronic renal failure, Parkinson’s disease, cerebrovascular disease, encephalitis, etc.; 2. psychiatric diseases: mixed anxiety depressive state, depression, anxiety disorders, schizophrenia, etc.; 3. primary sleep disorders: obstructive sleep apnea 4, drugs and other substances: alcohol, nicotine, caffeine, catecholamines, thyroxine, beta-blockers, oral contraceptives, etc. are prone to insomnia; 5, circadian rhythm disorders: delayed sleep phase syndrome, sleep phase forward syndrome, jet lag reaction, night work, etc.; 6, behavioral factors: psychophysiological insomnia, poor The sleep hygiene, irregular work and rest time, etc. Psychiatric disorders are the most common among secondary insomnia (50%), such as mixed anxiety and depressive states.