It is natural for elderly people to sleep less due to ageing, and insomnia is also a very unpleasant thing. However, the elderly are always sleepy, which is often easy to be ignored, so that the onset of the disease can not catch the time to treat, resulting in serious consequences. Sleepiness in the elderly, accompanied by dizziness, weakness and other symptoms, may be a manifestation of cerebrovascular disease. Sleep is a way for our brain to rest. The basal metabolism of the whole body decreases during sleep, and brain cells are no exception, which can reduce oxygen consumption and is a protective mechanism for brain cells. Oxygen supply to brain cells comes from blood, in the event of cerebral infarction and cerebral hypoperfusion, cerebrovascular blood perfusion is insufficient, the oxygen supply to brain cells is in trouble, brain cells are deprived of oxygen, nerve cells will send instructions to put us to sleep through a series of complex neurohumoral regulation to reduce the oxygen consumption of the brain and protect nerve cells. Therefore, elderly people, if you find a significant increase in sleep recently, and general weakness, dizziness, lightheadedness, forgetfulness, etc., you must think of finding a doctor for a detailed consultation to discover the cause as early as possible and intervene early for treatment to avoid leaving serious sequelae. Chinese medicine has always had the idea of “treating the disease before it happens”, and in the subhealthy state, we can make adjustments according to the physical condition, “first to protect the place that has not been affected by evil” to protect people’s health.