Sudden drowsiness in depression is not a self-repair, sleep disorders manifest themselves in a variety of ways, most of which are characterized by difficulty in falling asleep, early awakening, etc., and a small number of which will manifest themselves as drowsiness. Depression is a common mental disorder, characterized by persistent loss of interest, lack of pleasure and depressed mood, which can be accompanied by sleep disorders. The appearance of sudden drowsiness in depression is not self-repairing, it is a manifestation of the disease. Its sleep disorder manifestations are diverse, mostly difficulty in falling asleep, light sleep, early awakening, and some patients will have drowsiness or drowsiness and insomnia at the same time. The manifestation of depression repair should be that the sleep disorder is relieved, including the symptoms of difficulty in falling asleep and insubstantial sleep are reduced or disappeared, and the sleep gradually returns to normal. If the patient has difficulty in falling asleep suddenly appear drowsiness, be alert to the aggravation of the condition. Depression through treatment, most of the symptoms can be relieved, pay attention to maintain emotional stability, actively cooperate with the doctor’s treatment, and maintain communication with friends and relatives.