Even though human beings are obsessed with dissecting and interpreting dreams ("I was giving Gary Busey a backrub while riding a flying armadillo." "Ah, this means you are feeling anxiety about your career.") we really know very little about what causes them or what purpose they serve.
Science's Wild-Ass Guess:
The old Freudian theory was that dreams were expressions of our unconscious desires, but none of the cool psychologists still follow Freud these days. Besides, if Freud was right far too many people have a sick fetish for being forced to take pop quizzes in their underwear.
ALL MY DREAMS ARE COMING TRUE!
Others have suggested dreaming is a way for our brain to formulate new ideas through the use of "random thought mutations" (one of you New Age musicians out there, you can have that album title for free).
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