Since 1993, the Seoul National University School of Medicine has conducted a study on the "following the normal sleep time of healthy people on the risk of death" and conducted a group tracking analysis for 13,164 people. The research team of Professor Liu Yiyong from the School of Preventive Medicine in the medical school divides the study into 5 hours, 6 hours, 7 hours, 8 hours, 9 hours, and 10 hours of sleep time per day.
As a result, it was found that the mortality rate of the subjects with less than or more than the sleep time was increased compared with the sleep time of 7 to 8 hours, showing a U-shaped danger map.
The mortality rate of the sleep group below 5 hours was 21% higher than that of the 7-hour sleep group, while the death rate of the sleep group over 10 hours was 36% higher than that of the 7-hour sleep group!
Scientists say that sleeping on the weekend is no more than 8 hours, which is good for the body. Getting up more than 2 hours later than usual is harmful to the body.
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