In article, “Sleep variability and fatigue in adolescents: Associations with school-related features” by M.G Matos et. al. state that the average sleep duration of sleep duration was 7.5 hours during the week and 8.8 hours during the weekend , and the total average/day 7.9 hours out of several kids in the eighth grade and tenth grade. They found that little sleep hours can increase pressure with school work and can reduce school regular attendance (Matos et. al.). They did not find that poor sleep habits were directly related to poor academic performance in school. Adolescents who got better sleep had better habits and lowered stress. This is important because if teens got more hours of sleep each night, it could help reduce ‘bad habbits’ or stress in adolescents just by increasing their sleep hours.