1, age: sleep and age are closely related, the older the more prone to insomnia (the stability of the internal environment and circadian rhythmicity has changed after ageing); insomnia has a tendency to increase with age, and its course can change over time, with a tendency to relapse or recurrence. 2, gender: the same age, insomnia is more common in women, the incidence is two times higher than that of men. 3, marriage: divorce, widowhood or separation is a risk factor for insomnia. 4, socio-economic status: too low to worry about life all day long, too high may be mentally stressed, both can cause insomnia. 5, shift work: back to affect the internal circadian rhythm kind of change. 6, somatic diseases: most diseases can cause, such as due to a part of the body or organ lesions often lead to insomnia, such as chest tightness, palpitations, itching, cough, nocturia, wheezing, frequent urination, headache, etc. can interfere with sleep, causing insomnia, and insomnia can aggravate the patient’s hunger somatic discomfort, forming a vicious circle. 7, mental illness: various mental illnesses can cause insomnia, which is a common symptom of mental illness. 8, mental factors: more than 85% of insomnia is caused by mental factors, social, family and work and other conflicts resulting in tension, excitement, anxiety or fear can cause insomnia. 9, sleep environment: too much light, too loud, too high or too low room temperature, abnormal smell, etc. can lead to insomnia, jet lag and location changes can also lead to insomnia. 10, diet and drug factors: drinking strong tea and coffee before bedtime can stimulate the excitation of the cerebral cortex, and taking drugs such as anophylline, thyroxine, Ritalin and other drugs that can excite the center can often lead to difficulty falling asleep and waking up at night; sudden or rapid reduction of long-term use of sedatives and other sleeping pills can lead to insomnia with withdrawal. 11, poor sleep hygiene behavior 12, special sleep disorders, such as restless legs syndrome, biorhythmic phase problems, sleep apnea syndrome