It is possible that drowsiness is a sign of poor physical condition, and the presence of drowsiness is not necessarily a sign of depression. Because the core symptoms of depression are usually persistent depression and loss of interest, accompanied by anxiety or agitation, and even psychotic symptoms such as hallucinations and delusions, depressed patients often have sleep disorders, most of which show difficulty falling asleep at night or waking up early, but a small number of patients can show increased sleep or narcolepsy. Narcolepsy refers to excessive daytime sleep or feeling fatigue, fatigue and lack of energy despite sufficient sleep, or even sleeping for a long time during the day. It needs to be ruled out whether the excessive sleep is caused by lack of sleep, alcohol and other factors, or is caused by a disease. The common diseases are episodic sleeping sickness and idiopathic sleep increase, etc. The main clinical manifestations are drowsiness. 1, episodic sleeping sickness: belongs to the sleep disorder is drowsiness disorder, mainly manifested as uncontrollable daytime sleepiness, episodic sudden collapse, sleep paralysis, that is, from sleep to wakefulness during the emergence of temporary activity limitation, sleep hallucinations and night sleep disorder behavior; 2, idiopathic sleep increase: to excessive daytime sleep But not accompanied by sudden collapse as the basic characteristic. Patients have difficulty waking up in the morning or after a nap, take too long to wake up, have difficulty waking up, repeatedly fall back to sleep, and have no sense of mental recovery after waking up, with symptoms of irritability, unconscious behavior and blurred consciousness. The causes of narcolepsy are complex and varied. In addition to the above, it may also be related to hepatic encephalopathy, hypothyroidism, anemia, cerebrovascular disease, hysteria, or excessive sleep caused by drug abuse, etc. Patients are advised to seek medical consultation in a timely manner, and the most important thing is to first identify the cause and treat it for the cause.