Prompted by health warnings from organizations like the American Pediatric Association and others, schools are considering pushing back their start times to help students get more sleep. This is especially relevant for teenagers whose brains undergo a sleep-cycle phase shift during adolescence that causes them to stay up later. Advocates say a later start time will help students reap the academic and health benefits of more sleep. But opponents say there’s not enough evidence to disrupt the status quo. They fear later start times and later dismissals will cut into student athletics, extracurricular activities, family obligations and job responsibilities. In this Lowdown lesson, students will analyze the debate about school start time as it relates to changes in the sleep cycle that happen during adolescence.