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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Sea otters hold hands while sleeping so they don’t drift away from each other.
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47% of people have a nightmare at least once a month.
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Lack of water is the #1 trigger of daytime fatigue.
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"Dysania" is the state of finding it hard getting up out of bed in the morning.
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Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
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