Early stages of Alzheimer’s disease do not usually present with sleep disturbances, and as the disease worsens there may be a decrease in sleep quality. Patients in the early stages of Alzheimer’s disease may experience symptoms such as memory loss, disorientation, and dependence, which generally do not affect the quality of sleep. As the condition worsens, patients may experience abnormal mental behavior, such as crying or laughing for no reason and becoming easily agitated. Symptoms such as disruption of the biological clock, reversal of black and white, and even hallucinations may also occur when the condition worsens, leading to a decline in sleep quality. For patients with Alzheimer’s disease, family members need to care for them and keep them in a happy mood. If there is any discomfort, the patient should go to the hospital in time.