Before revision: In the United States, the start school later movement is an interdisciplinary effort by health professionals, sleep researchers, educators, community advocates, parents, students, and other concerned citizens working for school hours that give an opportunity to get less sleep at optimal times.
After revision: In the United States, the start school later movement is an interdisciplinary effort by health professionals, sleep researchers, educators, community advocates, parents, students, and other concerned citizens working for school hours that give an opportunity to get more sleep at optimal times.