Insomnia is a kind of common sleep disorders. Insomnia mainly refers to obstacles between start and maitain of sleep which makes the sleepy quality can not meet the physiological requirements of human body so that people feel tired, drowsy, low energy, attention-deficit disorder and so on. Webmd symptom checker offers you some helpful advices on the meaning of several symptom. In polysomnography chart we can make an objective judgment towards insomnia. The International dard is as follows: 1. Sleepy latency period extends. (more than 30 minutes) 2. The actual sleep time reduced. (less than 6.5 hours per night) 3. Awakening time increased. (every night above 30 minutes) At present, most sleep disorder belongs to the diagnosis of symptoms. Therefore, the diagnosis of insomnia should be siagnosised according to the patient's subjective symptoms through inquiry together with objective examination. The attitude and cognition of the patients towards insomnia is the reason why insomniac insomnia in late period.