Sleep disorders are a very common yet often overlooked clinical problem. 2006, a general population survey conducted by the Asia Pacific Sleep Society (APSS) in six cities, Beijing, Shanghai, Guangzhou, Nanjing, Chengdu and Hangzhou, showed that the prevalence of sleep disorders was as high as 57%, with more than half of the symptoms lasting more than one year. Only 13% had ever talked to a doctor about sleep problems. Even if they feel that their daily functioning has been significantly affected, only 21% of them have ever sought medical attention for the problem. Doctors often neglect to learn about sleep when dealing with patients who suffer from headaches, dizziness, gastrointestinal distress, chest tightness, fatigue, high blood pressure, and so on. Patients do not tell, doctors do not ask. The World Health Organization survey shows that doctors fail to recognize half of the patients with insomnia. The recognition rate, correct diagnosis rate, and treatment rate of sleep disorders are all low. Significance of Sleep Sleep is regulated and occurs through the body’s intrinsic rhythms that coincide with the earth’s rotation cycle – the biological clock. Sleep is an indispensable physiological process that occurs for about 1/3 of a person’s life. Sleep has growth, development, metabolic regulation: promote the development of brain function; restore physical strength and energy; enhance immune function; promote growth and delay aging; protect the central nervous system; learning to organize information and solidify memory. Definition of sleep disorders Multiple factors (biological, psychological, drug, psychoactive substance, physical disease, neurological disease, mental disease, etc.); abnormalities in sleep initiation and maintenance; disturbances in sleep and wakefulness rhythms; increase in the absolute value of the sleep time; abnormal behavior during sleep. Classification of sleep disorders International Classification of Sleep Disorders, Second Edition (ICSD-2) Released by the American Academy of Sleep Medicine in 2005, there are 8 major categories: 1. Insomnia: the most common sleep disorder. 2. 2. Sleep-related breathing disorders. 3.Centralized hypersomnia. 4, Circadian rhythm disorder sleep disorder. 5, Heteromorphic sleep. 6, Sleep-related movement disorders. Individual syndromes, normal variants and undefined items. Other sleep disorders.