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Adolescents often do not receive the 8 to 10 hours of sleep recommended by the American Academy of Pediatrics due to both late sleep-start and early arousal to attend school. In 2016, the Seattle public schools decided to delay the start time of secondary schools from 7:50 to 8:45 a.m. To examine the effect of that policy change on sleep patterns, sleepiness, grades, and school attendance, investigators compared these measures at the same time of the year both pre– and post–policy change. Participants were sophomore students attending science classes in two public high schools. Sleep duration and light exposure were measured with sleep-wake activity wrist monitors. Results were as follows:
Following the later start time, median sleep duratio…