I noticed a couple of years ago that I can't fall asleep unless I'm leaning against a wall. I thought it was a phase or something at first, but after a while it got to where I would push any bed is was in to the wall, just so I could lean against it. I guess it doesn't even have to be a wall. When I camp I still end up leaning against a tree, rock, and even other people? I'm not worried or anything about it, I would just like some insight.