Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
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People who sleep late have more mental stamina and can outperform early risers.
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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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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Honeybees never sleep.
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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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