One reason that kittens sleep so much is because a growth hormone is released only during 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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In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
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Honeybees never sleep.
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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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You burn more calories sleeping than you do watching television.
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People who sleep late have more mental stamina and can outperform early risers.
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Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
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