In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
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Those who get out of bed by 7am are more likely to be thinner and happier.
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The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
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