"...When the observer and the observed can separate and say this is the observed and this is the observer, which is an effect one seems to be having when lucid, then I think it's questionable whether [lucid dreams] should be considered subjective." (Fred Alan Wolf) - He further postulates that these, and perhaps all, dreams are actual visits to parallel universes.
Physicist Fred Alan Wolf held the belief that vivid dreaming, or Lucid dreaming, is actual visits to parallel realities. He believes the holographic model will allow us to develop a 'physics of consciousness' enabling us to begin exploration into these other dimensional levels of existence.