A study published in the Journal of Neurology, Neurosurgery & Psychiatry found that teens who receive less than 7 hours of sleep every night have an increased risk of developing multiple sclerosis as adults, while teens who reported low sleep quality were also more likely to develop MS. "Insufficient sleep and low sleep quality during adolescence dose-dependently increased the risk of multiple sclerosis. A change in sleep timing between work/school days and weekends/free days did not influence the risk of the disease," the study authors wrote.