Insomnia is the inability to fall asleep or stay asleep, resulting in sleep deprivation. Also known as disorders of falling asleep and maintaining sleep (DlMS), it is a common disease caused by various reasons such as difficulty falling asleep, short sleep depth or frequency, early awakening and insufficient sleep time or poor quality. Insomnia often brings great pain and psychological burden to patients, and can damage other aspects of the body due to the abuse of insomnia drugs for various reasons causing difficulty in falling asleep, short sleep depth or frequency (light sleep insomnia), early awakening and lack of sleep time or poor quality, etc. The clinical symptoms are characterized by difficulty in falling asleep, easy to wake up after sleeping, not being able to sleep again after waking up, waking up when sleeping, or not sleeping all night, and often accompanied by daytime mental inactivity, slow reaction, physical fatigue and even distress and chagrin, which seriously affects physical and mental health and work, study and life. 1, the common causes of insomnia 1, acute stress: common cases such as transient overexcitation, anxiety, mental tension, recent bereavement, physical discomfort, as well as changes in the sleep environment, across the time zone of jet lag reaction can cause transient or short-term insomnia. 2, drugs: common are caffeine, theophylline, thyroxine, cocaine, corticosteroids and anti-tremor paralysis drugs. The side effects of certain drugs have a disturbing effect on sleep, such as adrenaline-like drugs often cause headaches, anxiety, tremors, etc.. Arousal-sleep rhythm disorders produced by drugs with sedative effects. The rebound insomnia caused by withdrawal reaction, etc. 3, psychological: caused by excessive sleep defensive thinking, often overly concerned about their difficulties in falling asleep, worry about insomnia, worry that insomnia will affect the next day’s work, as a result, the more they want to fall asleep as soon as possible, the more excited, worry and anxiety make them more awake so that it is difficult to fall asleep. This kind of insomnia accounts for about 30% of the total number of insomnia. Second, the clinical manifestations of insomnia 1, difficulty in falling asleep; 2, can not sleep well; 3, early awakening, waking up after not being able to fall back to sleep; 4, frequently awaken from nightmares, self-consciousness all night long nightmares; 5, sleep after the energy did not recover; 6, the onset of time can be long or short, short days can be improved, long lasting several days difficult to recover. 7, easy to be awakened, some sensitive to sound, some sensitive to light. 8. Many insomniacs like to think about things. Third, the harm and impact of insomnia insomnia on the human body is mainly mental, generally will not make people fatal. However, long-term insomnia can make people irritable, aggressive, memory loss, inattention and mental fatigue. Insomnia affects people mentally and can easily lead to organic diseases. It can also make people’s immunity decrease and make their bodies consume more, because the secretion of growth hormone is mainly at night after falling asleep, so insomnia in children and teenagers can reduce the secretion of growth hormone, which is not conducive to the growth and development of the body. Insomnia can cause fatigue, restlessness, general discomfort, lethargy, slow reaction, headache, poor memory, and its greatest impact is mental, which can seriously lead to neurasthenia, mood disorders, and other conditions.