That's happening to me with The Host by Stephanie Meyer. Except, unusually, I'm not dreaming that I'm part of the story - I'm just dreaming about the story. Dana at One for the Books reviewed it a few months ago, and I think that's where I first came across the title. It's one of those best sellers and I was #67 in line when I put it on hold at the library so probably the Grandpa wouldn't read it, but just like with the Harry Potter books, he would be missing out.
It's a very compelling read, entertaining and (I think) fairly original. I am very much enjoying the main character's reactions to her environment, the people she encounters, the overwhelming emotions she has to deal with for the first time.
I really like it when I've got a good book.