Waking up at 3 to 5 a.m. may be related to sleeping early, neurasthenia, mental illness and other reasons. 1. Sleep early: most people’s sleep time is 6 to 8 hours, if the previous night’s sleep time is too early, there may be the phenomenon of waking up at 3 to 5 am. 2. Nervous breakdown: prolonged exposure to tension and stress may cause sleep disorders and early awakening. 3. Mental illness: such as anxiety disorders, depression, can be accompanied by symptoms of sleep disorders, such as insomnia, early waking. It is recommended that those who wake up at 3 to 5 am for a long time should go to the hospital in time, clarify the cause of the disease, and carry out standardized treatment under the guidance of the doctor, so as not to bring adverse effects to the body due to the delayed condition.