Some people sleep six hours a day is enough, and some people sleep 10 hours a day and still feel sleepy. So a few hours a day is enough? Regarding this problem, Shi Ming of Shanghai Chinese Medicine Insomnia Medical Cooperation Center thinks that although the amount of sleep time is related to age, there is still a "golden line", that is, 6-7 hours of sleep time should be guaranteed every day. In fact, all kinds of people have different requirements for sleep. Generally speaking, people aged 10- 18 need 8 hours of sleep every day, people aged 18-50 need 7 hours of sleep every day, and people aged 50-70 need 5-6 hours of sleep every day. But this is not absolute, it depends on how full of energy you wake up the next day. Clinical experiments have also proved that if you can't guarantee 6-7 hours of sleep every day for a long time, it is easy to cause insomnia. You should discourage your friend, because he will have a serious impact on your health. It's good to seek knowledge online, but it's not worth the loss to cause physical harm.