A Body at Rest (IMAGE) Brown University Caption If school starts early in the morning and adolescent physiology naturally produces later bedtimes, the inevitable result is less sleep. A new study adds to the case for later school start times for middle and high school students. Credit Mike Cohea/Brown University Usage Restrictions with credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.