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In the early 1990s, the University of Minnesota's landmark School Start Time Study tracked high school students from two Minneapolis-area districts – Edina, a suburban district that changed its opening hour from 7:20 a.m. to 8:30 a.m. and the Minneapolis Public Schools, which changed their opening from 7:20 a.m. to 8:40 a.m.
This result remained when controlling for sleep duration, which suggests that sleep variability may be more consequential for teen brain development than simply duration. Another study found that sleep duration was strongly associated with gray matter volume of the bilateral hippocampus among a sample of healthy children and adolescents. [20]
A 2002 study of older adults (age 40–65) in San Diego found 3.1% had complaints of difficulty falling asleep at night and waking in the morning, but did not apply formal diagnostic criteria. [63] Actimetry readings showed only a small proportion of this sample had delays of sleep timing.
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Saturday morning preview specials were aired on television annually to present previews of each network's fall lineup of Saturday-morning cartoon children's programming. Similar to the model for their new prime time counterpart shows, television networks in the United States and Canada would film a preview special for the fall season.
This article gives a list of United States network television schedules including prime time (since 1946), daytime (since 1947), late night (since 1950), overnight (since 2020), morning (since 2021), and afternoon (since 2021). The variously three to six larger commercial U.S. television networks each has its schedule. which is altered each ...
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