Drowsiness is a common symptom in patients with Alzheimer’s disease. Patients suffer from pathological drowsiness because the cerebral cortex is in a state of hypoxia and ischemia. Doctors will adjust the patient’s schedule to suit the situation, such as giving the patient a certain amount of sedation before bedtime. These include benzodiazepines for patients with milder symptoms and fenadine and olanzapine for patients who are more excited at night, or even injectable sedatives to force patients to sleep at night and increase the cortical excitement during the day, thus correcting the biological clock disorder.