In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
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Bats sleep 18-20 hours per day.
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44% of kids watch television before they go to sleep.
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Dieters who sleep more take off more fat that those who sleep less.
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People who sleep late have more mental stamina and can outperform early risers.
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Termites work 24 hours per day and they do not sleep.
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The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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