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Lucid dream
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Hypnos and Thanatos, Sleep and His Half-Brother Death by John William WaterhouseWikibooks has a book on the topic of
Lucid DreamingA lucid dream, also known as a conscious dream, is a dream in which the person is aware that he or she is dreaming while the dream is in progress. During lucid dreams, it is possible to exert conscious control over the dream characters and environment and have them perform feats which would be physically impossible in the waking world. Lucid dreams can be extremely real and vivid depending on a person's level of self-awareness during the lucid dream.[1]


ALSO:
http://www.lucidity.com/