I think i've had semi-lucid dreams a few times. The last 30 minutes or so before i wake up, i'll be having a dream, and regain my self-awareness, then the want to finish the dream, and learn it's story keeps me asleep. Never made my own impact on it except when logic is involved, or if it's a really [b]nope[/b] nightmare, as i will forcefully wake myself up, even if i'm not lucid.