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It's noon. People are eating. Then the longest part of the day begins.

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In a simulator, two lunches were compared: a light one and a heavy one with three times the calories.

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For the first half-hour, no difference. Then the heavy lunch caused more lane drifting.

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They had all slept just five hours. In this study the heavy lunch deepened the sleepiness already there.

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No one thinks about the afternoon over lunch. But that's when you still have a choice.

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If you've slept little and you're driving this afternoon, eat light. It replaces neither sleep nor a stop.