Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
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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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Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
15
Termites work 24 hours per day and they do not sleep.
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Honeybees never sleep.
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If you hold farts in during the day, they'll just come out when you sleep.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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