Sleeping all the time after hemiplegia of cerebral infarction may be caused by cerebral edema, or by the location of cerebral infarction. 1. Cerebral edema: cerebral infarction will cause the brain to be in a state of edema, and will also compress the surrounding nervous tissue and vascular tissue, thus causing the lack of oxygen in the brain, which will also lead to lethargy or drowsiness all the time. 2. Location of cerebral infarction: if the hemiplegia of cerebral infarction is further aggravated, and there is also a large area of cerebral infarction, or the location of cerebral infarction is located in the thalamus or the brain stem, then it may affect the upward reticular activating system, resulting in impaired consciousness or drowsiness all the time. It is best to go to the local regular hospital through the head CT or MRI, and also need to cooperate with the blood glucose, blood fat, blood pressure and other related examinations to further confirm the diagnosis, and then make targeted adjustments to the program.