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What is a lucid dream and what does it mean? References to lucid dreaming date back to at least the time of Aristotle and have appeared in a variety of contexts, ranging from a letter by St. Augustine, to the writings of Friedrich Nietzsche, and ancient Tibetan Buddhist texts. Though several works on the phenomenon appeared in the 19th and early 20th century, it is really only in the past decade that lucid dreaming has become the subject of scientific inquiry.
