New research finds students who start school at 8:30 in the morning instead of 8 a.m. are more alert in class, have better moods, and are on time more often. They even eat healthier meals in the morning.
The study was done last year at a Rhode Island boarding school.
Similar results have been found in some public schools.
Researchers say the reason may be biological, since teens are in their deepest sleep around dawn and have difficulty falling asleep before 11 p.m.