That's just how kids sleep. I find dd in the most bizarre positions, but luckily it doesn't seem to bother her. We gave her a pretty flat adult-size pillow a few months ago when she was sick, but I can't say she usually sleeps on it. In your case, however, it might keep her from butting up against the headboard. She also has a blanket, but generally doesn't want it (started refusing to be covered around the time we took her pacifier away), so we just dress her appropriately for the weather. When it's cold, we put her in a layer of thermal pjs, socks, and a fleecy footed blanket sleeper. Now that we're getting into spring we are shedding layers.