Those who get out of bed by 7am are more likely to be thinner and happier.
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Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
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The human brain is more active during sleep than during the day.
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Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
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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.
15
A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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You can reschedule your sleeping pattern by not eating 12-16 hours before you want to be awake. Upon eating after this time period, your internal clock will reset to a new day, with the time of your first meal being interpreted as "morning".
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