Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
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The higher someone’s I.Q. the more likely they are to be sleep deprived.
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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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The harder you concentrate on falling asleep, the less likely you are to fall asleep.
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The strangers in your dreams are actually people that you've seen in real life.
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The human brain is more active during sleep than during the day.
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