If you sleep only 6 hours a day, the risk of obesity increases by 27%; sleep only 6 hours a day, the annual weight will increase by 6.3kg; sleep only 5 hours a day, the risk of obesity increases by 37%; sleep 4 hours a day, resulting in an increase in calorie intake by 22%, equivalent to eating an extra KFC double burger every day! How many hours of sleep do you get every day?