2. Drinking water: All living things on the earth cannot live without water, and the water content of human tissues reaches over 85%. Every day, the wind, the sun and the sun will make the body lose water, so it needs to be replenished and absorbed by the tissues in the body.
3. Sleep problem: There are many reasons why people have to sleep, such as the laws of nature, the rotation and revolution of the earth. If the earth rotates once, not one day, but one year, people may only sleep once a year. If the earth rotates once, not for one year, but for many years, people may live a long life, which is also related to people's thinking, brain tissue activities, sports and mood fluctuations. These data are too active.
Therefore, why people eat, drink, disperse, excrete and sleep every day is a physiological reaction and a part of brain nerve activity.