The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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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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Sea otters hold hands while sleeping so they don’t drift away from each other.
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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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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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Cows can sleep standing up, but they can only dream lying down.
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You forget 90% of your dreams.
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