I definitely know that some of my dreams are lucid and that I am, in fact, asleep and dreaming. I know this because the very reason that I learned to recognize when I was asleep was because of nightmares, and I learned to wake myself up from them. So if I wasn't asleep, how could I wake myself up?? The moment of lucidity is what I think is in question here, but it doesn't make much sense to me. If we become lucid in a dream, does that change our sleep state? I don't think so. but perhaps it does. It is definitely an interesting idea to think about.