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The Rhode Island students “reported sleeping less at night (both on school nights and weekends), oversleeping and missing school more often, falling asleep in school... and experiencing difficulties staying awake while studying,” says Dr. Carskadon.
Another contributing factor to the teenage sleep deficit is the earlier start times for high schools than for junior high and elementary schools in most school systems around the country.
David Chandler’s high school, for example, begins at 7:60 a.m., requiring students to rise as early as 6 a.m., depending upon their proximity to school and morning routine. “To obtain nine hours of sleep with such a schedule, teens would need to retire at 9 p.m. or earlier — an unlikely scenario for the typical American teenager,” Dr. Carskadon points out.
The bottom line is that many adolescents are getting insufficient sleep at a time when their sleep needs may be increasing, not decreasing, as is commonly believed, she says.
Although changes in adolescents’ biological clocks seem to incline them toward later bedtimes and rising times, “there is no obvious decline in the need for sleep through the second decade,” Dr. Carskadon says. “In puberty, it appears that the need seems to go up a little” to more than nine hours of sleep, she adds.
Chronic sleep deprivation carries farreaching consequences for teenagers. Says David’s mother, Marcy, “It affects him in a
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