Rest refers to the process of relatively reducing activities in a certain period of time, so that people can relax physically and mentally, eliminate or reduce fatigue and restore energy. "Do it at sunrise and rest at sunset." It is the result of human long-term adaptation to the environment. Staying up late will be harmful to your health. Human adrenocortical hormone and growth hormone are secreted at night. The former is secreted before dawn, which can promote carbohydrate metabolism and ensure muscle development; The latter is produced after falling asleep, which not only promotes the growth and development of teenagers, but also delays the aging of middle-aged and elderly people.

Fatigue is a normal reaction of the body to recover physical strength and energy, and it is also an automatic control signal and warning that people have. If you don't rest immediately according to the warning, then the human body will collapse due to overwork and be riddled with diseases. When you feel that you have symptoms such as general weakness, muscle aches, dizziness, slow thinking, listlessness, palpitations, rapid heartbeat and breathing, don't continue. Pay attention to the combination of work and rest immediately, don't stay up late, and don't rush to work; Relax, be broad-minded, feel comfortable, don't worry about trifles, don't care too much about personal gains and losses, rest as soon as possible, and eliminate physical and mental fatigue.

Health means that a person is in a good physical, mental and social state. Health includes two aspects: first, the main organs are disease-free, the body shape develops well and evenly, the physiological functions of various human systems are good, and there is strong physical activity and labor ability, which is the most basic requirement of health; Second, it has strong disease resistance and can adapt to the effects of environmental changes, various physiological stimuli and pathogenic factors on the body.

Sleep is an effective way to rest, which is mainly suitable for people who lack sleep or manual workers. For manual workers, fatigue is mainly caused by a large number of acidic substances produced in the body. Through sleep, you can replenish lost energy and eliminate accumulated waste. Occasionally, if you are tired, you can lie in bed and close your eyes to rest, so that your muscles and nerves can relax completely before you get up and move.

If the cerebral cortex is extremely excited, but the body is in a state of low excitement, then sleep can't play a big role in coping with this kind of fatigue, because what is needed is not to recover physical strength through rest, but to find something to relax the nerves. Don't stop the activity, just change the content of the activity. More than1000 billion neurons in the cerebral cortex have different functions. They are arranged and combined in different ways to form different joint functional areas. When one area is active, another area will rest. Therefore, by changing the content of activities, different areas of the brain can be rested. Psychophysiologist Serginov did an experiment. In order to eliminate the fatigue of his right hand, he adopted two ways-one is to keep his hands still, the other is to let his left hand move properly when his right hand is still, and then test the grip strength of his right hand on a fatigue tester. The results show that the fatigue of the right hand is eliminated faster when the left hand moves. This proves that changing the content of people's activities is indeed a positive way to rest.