The desire to sleep all the time indicates that the body is in a state of suboptimal health. The reasons for always wanting to sleep are many, and in general can be divided into two categories. One is a variety of bad habits, and the second is the existence of certain diseases in the body. Long-term bad habits such as staying up late, sleep deprivation at night, the brain does not get enough rest, the daytime will be lack of spirit, yawning, general weakness, want to sleep. Long-term work in the suffocating environment without sunlight and ventilation, less oxygen circulation, poor circulation of blood and gas to the brain, lack of blood and oxygen, always want to sleep. Life and work are too stressful, the spirit of long-term tension, the human brain’s ability to receive information is reduced, it will be drowsy. In addition, the persistence of malnutrition and insufficient supply of energy to the body can also cause the desire to sleep. If none of these causes exist, the body may be sending out warnings. Various causes of insufficient blood supply to the brain, cerebrovascular infarction, and occupying lesions in the brain can lead to ischemia and hypoxia in the brain, and the person will always want to sleep. These conditions are mostly accompanied by sensory-motor dysfunction. Always wanting to sleep may also be an early manifestation of narcolepsy. The reason for sleepiness may be caused by some diseases, so if the symptoms cannot be relieved by changing the lifestyle habits, you should promptly consult a neurologist for a comprehensive examination to exclude cerebrovascular diseases.