In the early 1990s, medical research found that teenagers have biologically
different sleep and wake patterns than the preadolescent or adult population.
On the basis of that information, in 1997 the seven comprehensive high
schools in the Minneapolis Public School District shifted the school start
time from 7:15 a.m. to 8:40 a.m. This article examines that change, finding
significant benefits such as improved attendance and enrollment rates,
less sleeping in class, and less student-reported depression. Policy implications
are briefly discussed, acknowledging this to be a highly charged issue
in school districts across the United States.
Changing Times: Findings from the First Longitudinal Study of Later High School Start Times.
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