Scientific sleep should follow five laws: sleep time. Sleep in four seasons, spring and summer should be "late to bed and early to rise", autumn and winter should be "early to bed and early to rise", and winter should be "early to bed and early to rise". It is better to get up before sunrise, not too late. Normal people usually sleep about 8 hours a day, and those who are weak and sick should increase their sleep time appropriately. Rule 2: Sleep direction. Sleep with your head facing north and your feet facing south. The human body is influenced by the earth's magnetic field anytime and anywhere, and the brain is also disturbed by the magnetic field when sleeping. When people sleep, they take the posture of head north and feet south, so that the magnetic field lines can pass through the human body smoothly and minimize the interference of the earth's magnetic field. Rule 3: Sleeping position. Sleeping like a bow is effective, and lying on your side is light. Studies have shown that "sleeping like a bow" can just reduce the force of the center of the earth on the human body. Because the heart of the human body is mostly on the left side of the body, lying to the right side can reduce the pressure on the heart, and at the same time avoid putting your hands near the heart to avoid waking up from nightmares. Rule 4: Sleep time. People who are "night owls" or "go to bed early and get up late" should find their own biological clocks to improve the efficiency of sleep and rest. According to the theory of traditional Chinese medicine, the temperature difference between noon (from 1 1 p.m. to early morning 1 p.m.) and noon (from1p.m. to1p.m.) is the largest, so the human body needs proper rest. Rule 5: Sleep environment. Too many appliances should be avoided in the bedroom to ensure that the human brain is not disturbed too much during rest. In addition, don't wear "watches", "teeth" and mobile phones to sleep, which will affect your health.