Sea otters hold hands while sleeping so they don’t drift away from each other.
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The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
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Dieters who sleep more take off more fat that those who sleep less.
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If you hold farts in during the day, they'll just come out when you sleep.
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
12
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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