Dreams and Obessions

What is the difference between a dream and an obsession? Or can they be the same? They seem to blend in some areas. Dreams can be held inside, while others guess if there's any dream inside the person at all. While shifting to obsession, people see, people know. The dream becomes more obvious, more known, more vulnerable, seen by others and by critiques who gesticulate with all their tiny sharp fingers and knobby knuckles making sounds behind the ear like the cracks of a crunch of an insect's exoskeleton, feeding off the juicy life of the known dream, licking and smiling with all their teeth and flare a perfectly sharp nose because they have never been in a fight. Maybe that's the difference.