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.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
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The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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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.
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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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Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
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