1, eliminate fatigue, restore physical strength Sleep is the main way to eliminate physical fatigue. Because during sleep the gastrointestinal tract function and its related organs, synthesize and manufacture the body’s energy substances for use in activities. In addition, due to the decrease in body temperature, heart rate, blood pressure, respiration and part of the endocrine reduction, so that the basal metabolic rate is reduced, so that physical strength can be restored. 2, protect the brain, restore energy Sleep deprivation, manifested as irritability, agitation or depression, inattention, memory loss, etc.; long-term lack of sleep will lead to hallucinations. Those who get enough sleep are energetic, quick thinking and efficient. This is due to the fact that the brain in the sleep state oxygen consumption is greatly reduced, which is conducive to brain cell energy storage. Therefore, sleep is good for protecting the brain and improving brain power. 3.Enhance immunity, rehabilitation of the body The human body under normal circumstances, can produce antibodies to the invasion of various antigenic substances, and through the immune response to remove them, to protect human health. Sleep can enhance the body’s ability to produce antibodies, thereby strengthening the body’s resistance; at the same time, sleep can also make the tissues and organs to speed up self-healing. In modern medicine, sleep is often used as a therapeutic tool to help patients get through the most painful period, in order to facilitate the recovery of diseases. 4.Promote growth and development Sleep is closely related to children’s growth and development, infants and children continue to develop their brains for a long time after birth, and this process cannot be separated from sleep; and children’s growth is accelerated in the sleep state, because plasma growth hormone can be maintained at a high level for several hours during sleep. So we should ensure that children get enough sleep to ensure their growth and development. 5, delay aging, promote longevity In recent years, many research studies have shown that the healthy and long-lived elderly have a good and normal sleep. Human life is like a burning flame, and regular burning is life lasting; if the high and low burning is shortened, so that people die early. Sleep time is just like the minimum degree of flame burning, so it can slow down the aging, to ensure the long life. 6.Protection of human mental health Sleep is very important for the protection of human mental health and maintenance of normal mental activities. Because a short period of poor sleep can lead to inattentiveness, while a long period of time can cause unreasonable thinking and other abnormal conditions. 7, beneficial to skin beauty In the process of sleep, skin capillary circulation increases, its secretion and removal process is strengthened, accelerating the regeneration of the skin, so sleep is beneficial to skin beauty.