Adolescent sleepiness is usually considered to be caused by poor quality of sleep at night. Teenagers are under pressure to study, and staying up late to study or play with cell phones may make it difficult to fall asleep and easy to wake up during sleep. Prolonged late-night sleep will also lead to sleep cycle disorders, usually manifested as drowsiness, daytime depression, may also be accompanied by dizziness, confusion and other symptoms, generally eliminate the triggers can gradually improve. In addition, adolescent sleepiness may be nutritional deficiencies, excessive obesity, as well as a variety of disease factors: 1, nutritional deficiencies: adolescent body development is relatively rapid, nutritional supplementation is prone to insufficient systemic malnutrition, which usually leads to sleepiness; 2, excessive obesity: adolescent obesity is prone to apnea syndrome, that is, snoring or intermittent respiration during sleep. Apnea syndrome may lead to cerebral ischemia and hypoxia, usually leading to sleepiness every other day. In addition, obesity also tends to lead to excessive fatigue, usually also manifested as mental instability, drowsiness; 3, disease factors: episodes of sleeping sickness will lead to sleepiness regardless of time and place. Patients with depression, diabetes, hypothyroidism and organic brain diseases may also experience symptoms of drowsiness.