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There are many theories as to what 'dreams' are. Doorways to the subconscious, glimpses into the spirit realm, or visions of the future - at one point or another we all probably subscribe to one or more of these theories. Personally, I believe that dreams are the ways in which our subconscious minds attempt to show the conscious that the cold hard view of the world we see while awake is not the only dimension of existence. The most marvellous kind of dreams are 'lucid' dreams. These occur when you realize you are dreaming, but stay in the dream. At that point you can usually start to control the dream. This has led some researchers to think that dreams are simply random 'processes' in the mighty supercomputer that is the human brain, firing off as the system slips into 'power saver' mode!