One third of a person’s life is spent in sleep. But do you ever have truly healthy sleep? There are several determinants of healthy sleep: the amount of sleep, the quality of sleep, and the optimal amount of sleep. The length of optimal sleep time varies by age group: 14 to 18 hours for newborns, 9 to 10 hours for children, 7 to 8 hours for 2/3 of adults, <6 hours for 1/5, and usually about 6.5 hours for the elderly. Through sleep, tired nerve cells can be restored to normal physiological function, so that mental and physical strength can be restored. As a process necessary for life, sleep is an important part of the body's recovery, integration and consolidation of memory, and is an indispensable and important part of health, which is of great importance to maintain the physical and mental health of the human body. Therefore, we do not sleep for the sake of sleep. Rather, it is for the sake of being more flexible and refreshed the next day. If you don't get enough sleep the day before, the amount of sleep you need the next day will increase. Too little sleep often leads to "sleep debt", like a bank overdraft. Eventually, your body will demand that you pay these debts. It has been said that "sleep is as essential to human life as air, food and water". "Sleep, together with diet and exercise, are the three tripods of health." Quality of life: food, clothing, housing, transportation, and sleep. Because of this, insomnia is considered a major enemy of health . The "killer in the dark" - insomnia is right beside us. In today's increasingly fast-paced life, sleep is becoming a "luxury" for modern people. Due to the busy work schedule and colorful nightlife, the average sleep time of modern people is one and a half hours less than that of people 90 years ago. Insomnia caused by various factors has become a disease that threatens human health. Worldwide, about one-third of people have suffered from insomnia, and one-third of them are already suffering from severe insomnia. About 300 million adults in China suffer from insomnia and other sleep disorders, mainly in relatively economically developed areas. (Chinese Medical Association) 42.7 percent of Chinese adults suffer from sleep disorders, and only 25 percent of them have been to a hospital for treatment. (Scientific workers statistics) only drink water without food can live 7 days, but no sleep can only live 4 days. 50% of construction site accidents are caused by drowsiness, drowsiness is also the main cause of 45% of car accidents, and drowsiness is often the result of insomnia. Thirty percent of high blood pressure and 20% of heart disease are caused by poor sleep. The number of insomniacs suffering from depression is three times higher than normal, and 98% of people suffering from anxiety and depression suffer from insomnia. About 20-30% of adults worldwide suffer from insomnia, but 70% of them never think of it as a disease. The World Health Organization defines it as: difficulty falling asleep, trouble staying asleep, or no sense of recovery after sleep; at least 3 times a week for at least 1 month; and sleep disturbances that cause significant discomfort or interfere with daily life. (It does not refer to temporary sleeplessness caused by stressful stimuli, nor does it refer to insomnia caused by many medical conditions, such as chronic pain, high fever that may make it difficult to sleep; respiratory infections, coughing that can cause frequent waking, and certain acute infectious diseases, such as chorea and poliomyelitis obliterans that are often associated with insomnia.)