Sometimes when we read about things repeatedly (no matter how far out) we can form such vivid pictures of them in our mind's eye that they become part of our dreams and seem incredibly real. I suspect this is what has happened to you in your dream, Doug. I know my dreams can be incredibly convincing. Our dreams are also shaped by the manifestation of our desires, whether or not they are part of an objective reality.
Look up Lowell's syndrome regarding the canals on Mars. Really interesting stuff. I suspect something similar is happening to the "scientists" who have located Nibiru-- and please remember-- much like Wikipedia-- anyone can post any old thing that he or she wants on Youtube, and Google is nothing more than a search engine. Please don't necessarily consider it a definitive source, but test the information there against reputable sources, as you would any other.