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The information our conscious minds receive during waking hours is processed by our unconscious during so called “deep sleep”. We are in deep sleep only two or three hours a night. For the rest of our sleeping session, the unconscious mind is off duty. It gets bored. It craves recreation. So it plays with the material at hand. In a sense, it plays with itself. It scrambles memories, juggles images, rearranges data, invents scary or titillating stories. This is what we call “dreaming”.
—  Tom Robbins /v. whiskey river