I feel that there is no way that these images, or scenes are a type of waste that the body produces, like your regular bowel movements. However I do believe just like any other theory that you have to have multiple dreams and recordings to successfully “decode” a person. Such as in the “Barbra Sanders case study” this study is based on various samples within a dream journal of about 3,116 dreams over a period of 20+ years from a middle-aged adult woman (Schneider, 2010). The findings helped researchers see patters and familiarities in her everyday life and what was being portrayed in her dreams.
I am not saying that that your dreams will always be interpreted the same as someone else’s. That could all be tossed to an individual’s life experiences. Such as me, the reason that I saw spiders in a dream would be different to Jane Smith. Being as I hate spiders and am not keen on their presence, where as Jane may love them and have one for a pet. This also brings up my next point in “Lucid dreams” (Douglas Bernstein, 2008) there have been many individuals that have progressed in life because of what they had seen in a dream. People, such as Salvador Dali saw images in his dreams and progressed with his craft to make interesting works of art, becoming a well renowned artist of his time. There is also Albert Einstein who will forever plague the world with his astounding brain and understanding of mathematical and scientific theories that were well beyond his time, that he saw in his dreams. If a dream was some sort of waste or things that the body did just to do it, I feel that there would not be so many case studies and experiments