The basic plot of the film is based on a physiological phenomenon known as "lucid dreaming". Lucid dreaming means dreaming while knowing that you are dreaming. The term was coined by Frederik van Eeden who used the word "lucid" in the sense of mental clarity. Many of the dream state idiosyncrasies described in the film, such as the inability to read time on a digital watch or the tendency of light switches to malfunction, are described in studies authored by Dr. Stephen LaBerge of Stanford University, the leading American authority on lucid dreaming.

Film

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