EXCERPT :

Lucid dreams have been scientifically proven to exist. Stephen LaBerge of The Lucidity Institute used a special machine to track eye movements during a dream (these are linked to your eye movements within the dream). He asked lucid dreamers to point their eyes left and right in quick succession once they became “conscious” in their dreams, and this movement was recorded on the machine. For more information on this and other experiments, read Exploring the World of Lucid Dreaming.