Drowsiness in elderly patients with cerebral infarction may be related to the site of cerebral infarction, scope, and complications of cerebral infarction. 1. Site of cerebral infarction: when cerebral infarction is located in the temporal lobe, brainstem and other parts of the brain, it is easy to have a decrease in the level of consciousness and drowsiness. Elderly patients with relatively poor metabolic function are more prone to drowsiness. 2. Scope of cerebral infarction: when large cerebral infarction occurs in elderly patients, it may affect the upward reticular activating system, resulting in the decline of cerebral function, drowsiness, lethargy, and even coma symptoms. 3. Complications of cerebral infarction: bed-ridden patients with cerebral infarction are prone to pulmonary infection, electrolyte disorders, abnormalities in liver and kidney functions, all of which will affect the state of consciousness and lead to drowsiness. Drowsiness should be actively treated for cerebral infarction and symptomatic supportive therapy to improve the discomfort. In addition, cerebral infarction elderly patients with diabetes mellitus is relatively more people, should pay attention to whether there is the possibility of diabetic ketoacidosis, should also be timely to the hospital to check the blood glucose, urinary glucose and urine ketone body. It is recommended to go to the hospital in time to clarify the cause of the disease, and choose the appropriate method of treatment.