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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One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
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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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The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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44% of kids watch television before they go to sleep.
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The average cat sleeps about 2/3 of the day.
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