Why do people sleep? How long do you usually sleep?

Human body functions need to consume energy every day to complete all daily activities, such as work, walking, being in a daze and so on. This is why people eat, drink and sleep every day. But sleep and water supply are essential. Sleep is a whole-hearted rest, except breathing, of course. Moreover, sleep should not exceed eight hours. The reason, of course, is that it still has a great influence on your health. Moreover, it is suggested that the best time for spleen, stomach and kidney to rest is at night 1 1 to1. You must sleep at this time. We should also get into the habit of going to bed early and getting up early. Vitamin supplementation is also important. If you don't understand, please find the health newsletter. I learned a lot there.