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Interesting stuff. There is something called sleep paralysis you can get if you are waked at the right stage during your REM sleep (the deepest sleeping phase, named after its characteristic Rapid Eye Movements). Sleep paralysis will basically give you awake and aware dreams while not being able to move anything other than your eyes, since the brain more or less shuts down your control of your body while asleep so as to not act out your dreams.
I also know that there is a legal tea available that gives you very lucid and controllable dreams. You better fall asleep when you have taken it though, or you'll start hallucinating. lol. I can't remember its name at this point, it was just something I read an article about a while back.
I think that within a couple of decades we will have the technology to "dream" in a 100% controllable state whenever we wish, or at the very least affect the strength and theme of the dreams. In fact, crude versions of this technology we already have. I saw a documentary on Discovery channel on which some researchers had some kind of a machine that was able to affect the brain waves of a person inside a room that was proofed of all human perceptions (sight, sound, etc). People who where put into this "machine" while awake almost instantly got perception hallucinations such as the feeling of hands pulling their legs or touching their genitalia. As scientists learn more and more about the human brain, we will certainly witness the birth of a new entertainment industry.
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