The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
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You forget 90% of your dreams.
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Those who get out of bed by 7am are more likely to be thinner and happier.
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