People’s sleep and emotions will change with the day and night, weather and seasonal changes, so there is spring sleepiness and autumn fatigue. But some people sleepy may be pathological, always sleepy want to sleep more common reasons are: 1, sleep deprivation at night, mostly seen in often stay up late, night shift work crowd. 2, long-term insomnia, seen in the life and work of the more stressful white-collar, accompanied by anxiety, depression. 3, obstructive sleep apnea, due to its frequent sleep apnea and hypoventilation, resulting in the body hypoxia and carbon dioxide 4, episodic sleep disorder, which is a chronic neurological disease, mostly seen in children and adolescents, may be related to the role of genetic and environmental factors, mainly manifested as uncontrollable excessive sleep during the day, sudden collapse, sleep paralysis with hallucinations before falling asleep, can be based on their own situation to initially identify the cause.