There is a saying that people should go to bed late and get up early in summer, and some "experts" also say so. It has been scientifically proved that people should sleep for 7-8 hours every day. Less sleep time is harmful to health, inducing diseases and shortening life span. If you go to bed late, those who sleep at least 1 1 or 12 at night are called staying up late, and those who want to get up early are called getting up at 5 or 6 in the morning. In that case, you will only sleep for 5-6 hours every night. Obviously, sleep time is not enough. This is my first question about staying up late and getting up early in summer. Human blood viscosity is directly related to the onset of angina pectoris, myocardial infarction and cerebral infarction, but human blood viscosity is constantly changing in one day and has certain rules. Blood viscosity is the highest from 4 am to 8 am, especially in the elderly. Going to bed late is not good for people's cardiovascular and cerebrovascular diseases, so it is necessary to get up early. At this time, the blood viscosity is the highest. In this way, going to bed late and getting up early will increase the risk of cardiovascular and cerebrovascular diseases such as myocardial infarction and cerebral infarction in middle-aged and elderly people. Therefore, going to bed late and getting up early in summer is good for the health of middle-aged and elderly people. ! In addition, people will sweat more in summer, sleep at night without drinking water, and the human body is in a state of water shortage from midnight to early morning, which is more likely to increase blood viscosity, so it is more likely to have cardiovascular and cerebrovascular accidents. This is my second question about staying up late and getting up early in summer! In fact, the living conditions in the city are much better now. There are electric fans and air conditioners in summer. Many families in rural areas also have electric fans, and some towns with good conditions use air conditioning. There is no need to stay up late because of the hot weather. Morning is the best time to sleep, especially in the countryside. The weather is cool in the morning, which is a good time to sleep. Why not take the time to get some sleep? ! Why do you get up early? ! This is my third question about staying up late and getting up early in summer! Therefore, I think that in modern life, it is not appropriate to stay up late and get up early in summer. No matter what season, you can get up early by going to bed early and get up late by going to bed late. Sleeping for 7-8 hours is the best health care.