BACKGROUND
Insufficient sleep in adolescents has been shown to be associated
with a wide variety of adverse outcomes, from poor mental and physical
health to behavioral problems and lower academic grades. However, most high
school students do not get sufficient sleep. Delaying school start times for
adolescents has been proposed as a policy change to address insufficient
sleep in this population and potentially to improve students’
academic performance, reduce engagement in risk behaviors, and improve
health.
METHODS
This paper reviews 38 reports examining the association between
school start times, sleep, and other outcomes among adolescent students.
RESULTS
Most studies reviewed provide evidence that delaying school start
time increases weeknight sleep duration among adolescents, primarily by
delaying rise times. Most of the studies saw a significant increase in sleep
duration even with relatively small delays in start times of half an hour or
so. Later start times also generally correspond to improved attendance, less
tardiness, less falling asleep in class, better grades, and fewer motor
vehicle crashes.
CONCLUSIONS
Although additional research is necessary, research results that are
already available should be disseminated to stakeholders to enable the
development of evidence-based school policies.