The Art of Dreaming
Learn how to go into a dream consciously as your body falls asleep and mind stays awake.... And learn how to recognize the dream state so that you can realize you are dreaming and thus change the dream.
Those are the two methods for lucid dreaming. I think that Being able to go into a dream has a much broader use... As one can leave their body during this, or travel to whatever realm is wished. Its a point of consciousness where you relinquish control over your physical body and focus all energy into the mind. And at this point you have no control over your body, or your head, but you have a crisp clarity of thought as you are in a different plane. Everything at first is black, until you decide what you want to do, a simple thought can create a entire dream.