In recent years, the incidence of cerebrovascular disease, especially cerebral infarction, has been increasing year by year during the summer months, forming the second peak period after winter. Many elderly people have the onset of the disease in the latter half of the night or in the early morning of the next day, especially in the state of getting up at night. What are the reasons for this? 1, because in summer, whether indoor or outdoor, the temperature is higher, the human body to evaporate a lot of sweat, easy to cause the body’s tissue fluid to reduce, so that the blood concentration, blood viscosity increased. The elderly themselves arteriosclerosis, more susceptible to external factors, so the chance of cerebral infarction increased. 2, when people sleep, the cerebral cortex is in a state of inhibition, at this time, the body’s metabolic rate decreases, the heartbeat slows down, the blood flow rate also slows down, blood pressure can fall, and when people lie flat, some of the blood will be retained in the extremities, the elderly is even more so. When getting up in the latter part of the night, the body suddenly changes from the prone position to the standing position, which can easily lead to postural hypotension, causing insufficient cerebral perfusion and contributing to the formation of cerebral infarction. Therefore, in order to avoid inducing cerebral infarction when the elderly get up at night, the following measures should be taken: (1) Before going to bed, drink a moderate amount of cool water or milk and other beverages to prevent excessive sweat evaporation resulting in increased blood viscosity and slow blood flow. (2) after waking up at night do not rush to get up, to Hong Zhaoguang Professor warned us that, pay attention to the “three half minutes” that is: half a minute in bed; sit up and sit for half a minute; two legs hanging on the edge of the bed and so on half a minute. In this way, getting out of bed can largely avoid the occurrence of postural hypotension, thus reducing the cerebral ischemic attack caused by cerebral underperfusion, and also avoiding the sudden change of position and the resulting decrease in muscle tone, which can cause sudden collapse or fall injury. This has important clinical significance in preventing the formation of cerebral infarction.