The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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People who sleep late have more mental stamina and can outperform early risers.
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The harder you concentrate on falling asleep, the less likely you are to fall asleep.
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47% of people have a nightmare at least once a month.
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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You forget 90% of your dreams.
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Those who get out of bed by 7am are more likely to be thinner and happier.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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