Today is World Sleep Day. Nowadays, many people habitually stay up late, sleeping less and late at night, and feeling listless during the day. What are the hazards of staying up late? How to avoid staying up late? In this issue of "One Minute Health Course", Sun Yang, deputy chief physician of the General Medicine Department of the First Affiliated Hospital of Tsinghua University, explained relevant knowledge to netizens. Sun Yang said that under normal circumstances, the normal person's sleep time is seven to eight hours. If they fall asleep late and sleep for less than this time, it is called staying up late. "Staying up late has many hazards to the body. Staying up late for a week may cause dark circles under the eyes, deep bags under the eyes, acne and acne on the skin, eye fatigue, and inattention," Sun Yang said. "If you stay up late for more than a month, you may experience increased blood pressure, blood sugar, and heart discomfort, which can also seriously affect resistance and reduce immunity." Sun Yang cited common diseases in life, such as chronic pharyngitis, gastrointestinal discomfort, and repeated colds, as related to low resistance. In addition, staying up late can also affect the endocrine system, causing menstrual disorders in women and obesity in men and women. "If you stay up late for more than a year, there may be organic diseases, such as hypertension, diabetes, heart disease, and even tumors and sudden death," Sun said. How to avoid staying up late? Sun Yang suggests avoiding strenuous exercise two hours before bedtime, and avoiding eating and drinking too much. You can bubble your feet and listen to soothing music. When lying in bed, don't look at electronic devices such as mobile phones, which is conducive to falling asleep as soon as possible. (Liao Xinshe)