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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Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
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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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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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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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