The most likely cause of sleeplessness is idiopathic hypersomnia, which tends to occur in young people, with an average age of onset between 16 and 21 years. This disease is characterized by difficulty in waking up, this type of patients, in the sleep is difficult to be woken up, the general alarm clock can not be woken up, only some special means, such as violent shaking, or beat these ways to wake up. Moreover, these patients are often very bad-tempered and irritable after being awakened, which is similar to the waking up like this. After awakening, it is easy to fall back to sleep, and there are also unconscious behaviors and blurred consciousness. Generally speaking, the sleep time of such patients is often more than ten hours at night, and the duration of daytime nap is more than one hour, and the patients do not have the feeling of mental recovery after waking up, which is a kind of pathological sleep.