Changes in sleep and activity from age 15 to 17 in students with traditional and college-style school schedules

Sleep duration and physical activity decline with age during adolescence. Earlier school schedules may contribute to these declines. The aim of this longitudinal study was to track changes in sleep and activity of Icelandic youth from primary to secondary school and compare students who enrolled in secondary schools with traditional and college-style schedules.We measured free-living sleep and activity with wrist actigraphy and body composition...