I know this is probably an unpopular view, and I don't know why it is, but I find when I read Tolkien my mind loves to wander. I love his stories, I love his characters, I love the movies based off his books, but I lose focus when reading his books. It took me a while to figure it out but I believe it's because there is little dialogue compared to description of adventure. I think I'm a reader who thrives off character interaction, and sometimes I would read two whole chapters in The Hobbit where there was only a line or two of dialogue.