1. Emotionally, such as mental stress in life
2.Changes in social life and environment, such as light, too much noise temperature is too hot. Changing the mattress and travel across the world, working time and shift
3.Sleep problems coming from the diseases of sleep directly, such as abnormal limb movements while sleeping. The lack of breathing during sleep a while.
4.Physiological disorders of patients with more sensitive than normal, such as high alert status, and excitement easy
5. Psychiatric disorders such as depression. In the group concerned, mental disease 6
.Symptoms of illness or physical discomfort, such as Alzheimer's disease, disorder of hormone, chronic cough, pain, breathing hard to wake up to urinate frequently. Other
7. Using drugs or substances of some kind.
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