There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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Bats sleep 18-20 hours per day.
5
If you hold farts in during the day, they'll just come out when you sleep.
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The human brain is more active during sleep than during the day.
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Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
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