Yeah, I had that a little over a week ago! The imagery was vivid. My awareness that I was dreaming kind of crept up on me discreetly. I knew I was dreaming and just started going about things. My sense of awareness was probably sitting at, say, 3.5/5. I didn't have *complete* comprehension of my situation, but I causally enjoyed the experience (flying, making things appear, confronting a DC).