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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44% of kids watch television before they go to sleep.
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Lack of water is the #1 trigger of daytime fatigue.
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You forget 90% of your dreams.
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One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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Bats sleep 18-20 hours per day.
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47% of people have a nightmare at least once a month.
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