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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Cows can sleep standing up, but they can only dream lying down.
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"Dysania" is the state of finding it hard getting up out of bed in the morning.
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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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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