You're right, Ann... theoretically
Back to topic: I noticed that sitting in a sofa, cross legged and reading is a much more satisfying experience as I don't have to use my hand to prevent the book from closing, changing pages. I just hit the next button every now and then.
I wonder if the position you're in actually changes your reading experience, assuming none of them are painful. I actually tend to bounce around a lot. I should try and keep track of any correlation between the way I'm sitting and how happy I am with the story.