Abnormal amount of sleep and abnormal behavior during sleep are also manifestations of disturbances in the normal rhythm of sleep and wakefulness. It can be caused by a variety of factors often related to physical diseases. Sleep disorders 1, the amount of abnormal sleep can include two categories: one is the excessive amount of sleep, such as various encephalopathy, endocrine disorders, metabolic abnormalities caused by narcolepsy or drowsiness, as well as brain lesions caused by the episodic sleeping sickness this sleeping sickness is often a short period of time (generally less than 15 minutes) irresistible sleep episodes often accompanied by falls, sleep paralysis and hallucinations before falling asleep and other symptoms. Another type of insomnia is sleep deprivation with less than 5 hours of sleep throughout the night, which is characterized by difficulty in falling asleep, shallow sleep, easy waking or early waking, etc. Insomnia can be caused by external environmental factors (too much light in the room, too much noise around, night shift, car or boat, just arrived in a strange place), physical factors (pain, itching, violent cough, drinking strong tea or coffee before bed, frequent night urination or diarrhea, etc.) or psychological factors (anxiety, fear, excessive (anxiety, fear, excessive thoughts or excitement). Some diseases are also often accompanied by insomnia, such as neurasthenia, anxiety, depression, etc. 2.Sleep onset abnormalities Refer to some abnormal behaviors during sleep, such as sleepwalking, sleep talking, night terrors (sudden stirring, screaming, rapid heartbeat, shortness of breath, general disorientation or hallucinations during sleep), nightmares (nightmares), teeth grinding, involuntary laughing muscles or involuntary jumping of limbs, etc. These episodes of abnormal behaviors are not caused during sleep. These episodes of abnormal behavior do not occur during the whole night sleep but mostly occur during certain sleep periods. For example, sleepwalking and night terrors mostly occur in the late phase of orthogonal sleep; while somnambulism is mostly seen in the middle or even the early phase of orthogonal sleep; teeth grinding, involuntary laughing, muscle or limb jumping, etc. are mostly seen in the early phase of orthogonal sleep; and nightmares are mostly seen in the heterogeneous sleep period. The harm of sleep disorders Long-term insomnia can cause a decline in immune function, weakened resistance, cause memory loss, affect work and study, leading to plant nerve dysfunction, frequent insomnia can cause Alzheimer’s disease, frequent insomnia can cause premature aging and shorten life expectancy, insomnia in children can affect growth and development. Psychological treatment of sleep disorders in conjunction with medication can generally improve, but those caused by other diseases depend on the elimination of the cause.