Implementing a 10 a.m. start, led by The Centers for Disease Control and Prevention and the American Academy of Pediatrics in 2014, saw a decrease in student illness after 2 years of over 50%, and reverting to an 8:50 a.m. start reversed this improvement, leading to an increase of 30% in student illness. The 10:00 a.m. start was associated with a 12% increase in the value-added number of students making good academic progress (in standard national examinations), which was significant and equivalent to 20% of the national benchmark.⁠ ⁠ Implementing school start times later than 8:30 a.m., which may address the circadian delay in adolescents' sleep rhythms more effectively for evening chronotypes, appears to have few costs and substantial benefits.⁠ ⁠ ⁠ #school #academia #biology #science #sciencenews