One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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The strangers in your dreams are actually people that you've seen in real life.
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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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Bats sleep 18-20 hours per day.
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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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