Thomas Edison invented the light bulb because he thought sleep was a waste of time. But he was a 10-hour sleeper -- six hours a night and two, two-hour naps during the day.

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It's as if you stayed up one full night.

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As a manager, you want to know hidden costs. What would you give for a 5-percent or 10-percent improvement in your bottom line, or in the performance of your workers?

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Whereas in the United States we pretend this isn't a biological issue. We just struggle through. We pay for that.

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