The feeling of not being asleep while sleeping is caused by too light sleep or more light sleep time. In the deep sleep stage, the patient has no self-awareness of sleep and is in deep slumber, and has no sense of the passage of time, i.e. the patient does not know that he/she has gone to sleep. However, in the light sleep stage, patients have some self-knowledge and also wake up easily. If patients sleep too lightly for a long time or have too many periods of light sleep in the overnight sleep cycle, it will cause patients to be awake easily for more time and have memory of the sleep process, and this memory always thinks they are not asleep. Some patients even complain of long periods of sleeplessness for 1-2 years, which cannot exist. Therefore, patients with this problem can undergo sleep monitoring to clarify whether they have too much light sleep by objective examination.