It is a sign of abnormal amount of sleep and abnormal behavior during sleep. It is also a sign of disruption of the normal rhythmical alternation of sleep and wakefulness. It can be caused by a variety of factors. It is often associated with somatic diseases. It includes sleep disorders and anomalous sleep. Sleep is closely related to human health. However, according to surveys, many people suffer from sleep disorders or sleep-related diseases, and the proportion of adults with sleep disorders is as high as 30%. Experts point out that sleep is an extremely important physiological function to maintain human life and is essential for the human body. Therefore, sleep disorders must be given sufficient attention. Long-term insomnia can lead to brain dysfunction, causing a variety of harm to the body and seriously affecting physical and mental health.