I cannot remember what led into it, aside from that I was escaping an undesirable situation, but I had a moment of clarity and realized that I was dreaming, and that I could do whatever I wanted. I decided to fly, and I shot forward, moving really fast through the sky. I could feel the wind whipping past my face and could see a village of very similar looking buildings below (I remember feeling like that had been created as a backdrop or an after-effect). As I was flying, I became a little scared because I was so high up, and then I remembered that I was dreaming, and I sort of yelled/chanted, "I'm lucid! I'm lucid!" to keep remembering.
It occurred to me that I should be able to do other things, but I felt like it was taking a lot more energy for me to maintain lucidity, and I was afraid of pressing my luck - I am hoping that I will get better at this as I experience it more often.
I decided to land next to a building. I remember worrying that I was going too fast, so I allowed physics to reorient itself around my landing, so that I wouldn't crash. Then I walked up to the building and saw a woman, who slowly transformed into a grey alien. Then I woke up.