The Archives of Pediatrics and Adolescent Medicine has conducted a study that argues students grades can improve if school started a 1/2 hour later than it currently does.
From adolescence, children have a delayed sleep phase - they sleep later and need about 9.25 total hours of sleep.
One test case in Rhode Island revealed that after the delayed start: students who got at least eight hours of sleep went from 16% to 55%, attendance improved, there were fewer visits to the health center for fatigue-related complaints and far less students said they felt unhappy, depressed, annoyed or irritated.
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