WHY can lack of night sleep result in obesity? Lack of sleep increases appetite, raising the risk of obesity. Due to insufficient sleep, the body mistakenly believes it is short on energy. Depending on the individual, a healthy nights sleep is 5-10 hours. Elementary school students should sleep 8-12 hours, and middle school students should sleep 6.5-10 hours. Most adults get 7-8 hours of sleep. @Health 14.9K views11:35
