sounds like u were semi-lucid. meaning yes, you were lucid, but you were not able to maintain it for long.

This happened to me alot in my first couple of lucids - or if i have one w/out trying. I think it helps to have goals of things you would like to do while you are lucid, otherwise - with me, I'll end up going with the flow and either wake up or just loose lucidity. When i try lucid tasks like flying and morphing things it keeps me lucid and in control.

If you have anther false awakening try to morph things in the room - or try opening the door expecting a certain dreamscape on the other side.