Excessive sleep has: 1. Narcolepsy, which refers to excessive daytime sleepiness or sleep episodes, or an excessively prolonged transition time to a fully awake state upon awakening, not due to sleep deprivation, medications, organic brain disease or physical illness, and not part of the symptoms of some psychiatric disorder (e.g., neurasthenia, depression). 2, episodic sleeping sickness, is an unexplained daytime sleepiness and uncontrollable sleep episodes, accompanied by nocturnal sleep disorders and sudden collapse episodes. The cause is unknown in most patients, and some patients are due to damage to the subthalamic or midbrain gray matter periaqueductal structures, or may be due to reticular activating system lesions or neurohumoral defects, which occur in 10-20 years of age, with the main symptoms being sleepiness and sudden collapse.