Occasionally I too have this ability to "wake up" within a dream and thus exert at least some form of influence over it, such as an ability to fly around the dreamscape. I even came up with a system to reliably verify whether or not I was indeed in a dream state. It's very simple actually. The first thing I do is look around for something with writing on it. Having done that I then turn my head and then back. If the wording has changed, I am dreaming. If I don't do something like that, I fall back into the "subconscious dreaming state" much faster than I would have than otherwise.
