Amnesia refers to a significant decline in memory, especially in the recent memory decline, mostly in the elderly, and the occurrence of amnesia in the 20s should be noted to exclude the possibility of cerebrovascular disease, but this case is rare. Under normal circumstances, due to poor sleep quality for a long time, staying up late, etc., affecting the normal sleep habits, over time resulting in cerebral ischemia, hypoxia, gradually daytime drowsiness, fatigue, dizziness and forgetfulness and other clinical symptoms, by correcting poor sleep habits, to ensure that about 6-7 hours of sleep per day, the above symptoms can gradually improve. In case of obese young patients, attention should be paid to whether there is sleep apnea at night and ask whether there is dry mouth, daytime drowsiness and fatigue in the morning. Since prolonged airway insufficiency will affect the oxygen supply to the brain, patients will report gradual brain hypoxia and memory loss, and in severe cases, cognitive dysfunction or even the eventual development of dementia, so young amnesic patients in their 20s should not be careless to avoid delaying clinical treatment.