In recent years, the social atmosphere has become more and more open, and more and more celebrities have begun to try to sleep naked to relieve stress. Artists including Lin Chi-ling, Wang Leehom and Xiaoxian all admitted that they had the habit of sleeping naked when interviewed. In fact, as early as1990s, Toshi Maruyama, a Japanese doctor of medicine, published many books, such as "Naked Sleep Health Care Law" and "How to Sleep the Healthiest", and even received more than 4,000 postcards and phone calls from listeners all over Japan within one year. Traditional eastern and western costumes affect the habit of sleeping naked. Dr. Maruyama, who has advocated that naked sleep has many benefits for human body for many years, said that in fact, the naked sleep culture in the East is not as developed as that in the West, which is mainly related to traditional costumes. This is because most eastern societies belong to the farming system. No matter Tang suit, Hanbok and kimono, they all adopt the design of opening, while the western society is dominated by hunting society, and shirts and T-shirts with closed round necks are also used in clothing. Most of the former will not tighten the chest and abdomen during sleep, so it can make the parasympathetic nerve responsible for relaxation in a dominant position during sleep, while the latter will * * * sympathetic nerve, making it excited because of the heavy sense of bondage, making it difficult for people to relieve stress during sleep. Over time, a naked sleeping culture has been developed, and the clothes with closed neckline are taken off when sleeping, which makes the whole body more relaxed. Sleeping naked and burning fat can better increase blood circulation. A study published by the National Institutes of Health (NIH) in 20 14 pointed out that if the environment is cool when sleeping, the body will burn more fat to raise the body temperature, while when sleeping naked, it will lose the warm effect of clothes, so it can improve metabolism and help to lose weight. Dr. Maruyama said that taking up one-third of the sleep time every day actually consumes a certain amount of heat, but if you don't turn over when you sleep, it will lead to the constant pressure of bedding on one side of your body and the poor blood circulation. It will also lead to a drop in body temperature and poor metabolism. When sleeping naked, because the body is not bound by clothes, the number of turns will naturally increase when sleeping, which can relax the body repeatedly, improve blood circulation and naturally help to lose weight. Naked sleep softens tight muscles and can avoid urinary tract infection. In addition to relieving stress and losing weight, Dr. Maruyama also pointed out that by improving blood circulation during naked sleep, muscle tension and soreness such as shoulder and neck pain and low back pain can be softened and relaxed. Moreover, after taking off underwear, the lymph of the whole body will become better and improve immunity because it is not oppressed. At the same time, * * * will not easily breed bacteria because of ventilation, and annoying urethritis, fungal * * and other urinary tract infections can be improved. However, Dr. Maruyama also reminded the public that because the body is in close contact with the bedding when sleeping naked, skin allergies may occur if the quilt or sheets are not clean enough. Therefore, when people try to sleep naked, Ying Qin changes the sheets and takes a bath before going to bed. If you are not used to sleeping naked at first, you can also sleep in a coat * * * *, and then take off your coat after you get used to it.