Lucid dreaming

Lucid dreaming is the conscious perception of one's state while dreaming, resulting in a much clearer (lucid from Latin, lux "light") experience and sometimes enabling direct control over the content of the dream, a realistic world that is completely in the control of the dreamer. The complete experience from start to finish is called a lucid dream. Stephen LaBerge, a popular author and experimenter on the subject, has defined it as "dreaming while knowing that you are dreaming."