In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
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If you hold farts in during the day, they'll just come out when you sleep.
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Dieters who sleep more take off more fat that those who sleep less.
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The average cat sleeps about 2/3 of the day.
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Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
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