Insomnia is considered to be a sleep disorder that is characterized by insufficient duration or poor quality of sleep or a combination of these phenomena over a significant period of time. The absolute duration, the quantity of ours spent while sleeping is not critical factor, since different people have a different normal, sufficient duration of sleep.
Causes of insomnia can be very different: a strong overwork, too bright and noisy room where a person is supposed to sleep, various diseases, etc. A negative effect on sleep structure also has shift work and air travel with the change of time zone. Diagnosis of insomnia should be ...