Scientific American: Psychology

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Researchers at the University of Michigan used a free smartphone app to collect bedtime and wake-time data from 8,000 people in 128 countries. No big surprise: most people fail to get the solid eight hours that experts often recommend. Folks in Singapore average the least sleep, and the Dutch get the most. Other findings:

• Women average 30 minutes more snooze time than men.
• Middle-aged men get the least shut-eye.
• Bedtime, not wake time, makes the biggest difference in how much sleep you ultimately get.

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