The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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You forget 90% of your 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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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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The strangers in your dreams are actually people that you've seen in real life.
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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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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