One reason that kittens sleep so much is because a growth hormone is released only during 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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47% of people have a nightmare at least once a month.
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Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
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Honeybees never sleep.
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"Dysania" is the state of finding it hard getting up out of bed in the morning.
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