“While some have contested how accurate or sound the Edina test case is, well-controlled and far larger systematic studies have proved that Edina is no fluke. Numerous counties in several US states have shifted the start of schools to a later hour and their students experienced significantly higher grade point averages.” SleepIqLater Start TimesTeen Age Sleep Studies Book:Why We Sleep: Unlocking the Power of Sleep and Dreams Source: Why We Sleep: Unlocking the Power of Sleep and Dreams