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Eight in the evening. Everyone is back home, and tomorrow they set off early.

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School starts when the timetable says it does, not when the students have had enough sleep.

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In Kentucky, when the school bell was pushed back by an hour, crashes among young drivers fell by sixteen per cent.

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Over the same period, the crash rate in the rest of the state rose by eight per cent.

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They hadn't learned to drive any differently. They'd simply had some extra sleep.

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The time you start sets the time you sleep. And that matters when you drive, too.