Another theory states that dreaming is our brain tidying itself up and disposing of useless "junk thoughts." In order to buy this idea, though, you have to accept that the average guy's dreams about tits and being Batman are junk, and we're sure you agree that's simply unacceptable.

Dreams are windows to the soul, people.

Of course both of these seem awfully high-minded when you consider that animals also dream. Does your dog really have excess thoughts he has to get out of his overloaded doggy brain?

Perhaps weirdest of all is the mounting evidence that much of what influences our dreams comes from outside, not inside, our heads. Noises and scents may have an effect on the content of our dreams, and we bet your wacky tealeaf reading, dream-interpreting aunt didn't take into account the Earth's geomagnetic activity during her analysis.

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