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Seven o'clock, outside the school. But for many teenagers, the body still thinks it's night.

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In the teenage years, the body clock shifts later. You fall asleep later, and waking up gets harder.

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At eighteen, you're old enough to drive. But at seven, you may not be fully alert yet.

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It's not laziness. It's the natural rhythm of a body that is changing.

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And when that body gets behind the wheel, sleepiness is everyone's business.

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At eighteen you can drive. But you still need to sleep. Protect your sleep before you leave.