The group that spearheaded the healthy secondary school start times movement! Resources & local advocacy support. #SleepMatters #SchoolStartTimes #ItCanBeDone Start School Later™ is a registered 501(c)(3) organization committed to healthy and safe school start times. Start School Later is a coalition of health professionals, sleep scientists, educators, parents, students, and other concerned citizens dedicated to increasing public awareness about the relationship between sleep and school hours and to ensuring school start times compatible with health, safety, education, and equity.