dream as a world

I don't know if we've think this way: dreams as a bordered world. I began to feel that sometimes in my dreams, many places were familiar only when I was in that dream; but when I woke up they don't make much sense any more. So I'm thinking the only possibility is likely to be that I have only seen them in previous dreams. Thus if dreams are composed like short stories( or long ones ), then is it possible that instead of totally independent stories, the author set them up all in one world, or country, or city? Like in Partners in Murder, Tommy and Tuppence spent all their time in England. Thus those locations only appears in that world. How mysterious.