According to various questionnaire surveys around the world in recent years, the incidence of insomnia is around 30%, while those with sleep problems should be more than 50%. The 2006 Survey Report on Insomnia among the General Population in Six Cities in China shows that about half of the adults in major cities in China have been troubled by insomnia to varying degrees in the past year. However, another survey shows that only about 20% of insomnia patients go to the hospital on their own initiative, and only a very few of them seek help from specialists. This shows that although insomnia is more common today and the incidence of insomnia is very high, how to correctly understand and effectively prevent insomnia has not yet attracted much attention. A few important figures related to sleep 1. One third of a person’s life is spent in sleep. If you take 80 years old, it takes up about 27 years of your time. 2, if we only drink water without food can survive 7 days, while not sleep can only survive 4 days. 3, about 30% of the world’s adults have suffered from insomnia, but 70% of them never thought that this is also a disease. 4, about 55% of construction site accidents caused by lack of sleep, insomnia is also the main cause of 45% of car accidents. 5, about 30% of high blood pressure and 20% of heart disease is caused by poor sleep. 6, the number of insomniacs suffering from depression is three times more than the number of people with normal sleep, and more than 90% of patients with anxiety and depression are accompanied by insomnia. Since 2001, the World Health Organization (WHO) International Centre for Mental Health and the Psychiatric Foundation have designated March 21 as World Sleep Day, in the hope of raising the awareness of society as a whole about healthy sleep. March 21 is not an arbitrary date; they believe that March 21 is the first day of spring every year, based on the relationship between the earth’s latitude and longitude and the sun’s light. This day also happens to be the “vernal equinox” of the Chinese lunar calendar. This day also happens to be the “spring equinox” of the Chinese lunar calendar. The change of winter to spring is the law of the seasons in nature, and our body also has the sleep law of “sleep at night, awake at day”. The “heaven” refers to the natural world, human beings grow in the embrace of nature, and the relationship between them should be mutual influence and balanced coordination. Every year, World Sleep Day has a theme, for example, in 2011, the theme was “Focus on sleep for middle-aged and elderly people”.