Most teenagers are chronically sleep deprived. One
strategy proposed to lengthen adolescent sleep is to delay secondary
school start times. This would allow students to wake up later without
shifting their bedtime, which is biologically determined by the
circadian clock, resulting in a net increase in sleep. So far, there is
no objective quantitative data showing that a single intervention such
as delaying the school start time significantly increases daily sleep.
The Seattle School District delayed the secondary school start time by
nearly an hour.
This pre-/post-research study showed that
there was an increase in the daily median sleep duration of 34 min,
associated with a 4.5% increase in the median grades of the students and
an improvement in attendance.
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