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Eleven o'clock at night. You fill up at the service station and set off anyway.

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Driving at night seems practical: empty roads with hardly anyone around.

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With less than four hours of sleep, drivers are found at fault fifteen times more often.

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With five hours of sleep, the rate doubles. With six, it's a third higher. The baseline is seven to nine hours.

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Empty roads don't make up for lost sleep. They just leave you alone with it.

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Sleeping first costs you one night. Going without can cost everything else.