Lucid Dreaming is dreaming while you are aware you are dreaming. This allows you to control your dreams and have fantastical experiences.
The lucid dreaming wikibook gives you all the information you need about improving your dream recall, inducing lucid dreams, and using them to do whatever you want. There are also external references from which you can learn more.
"Very nice book: very complete and useful, and also well written!" - Johan
