My first occurred when I was about 10, and it was pretty humorous.

It was the night before Christmas, and I was very excited about getting presents the next day. I had a dream that I was in a city but the sky, buildings, and ground were all different shades of orange. All the buildings were 2-dimensional and slightly curvy. There seemed to be no one in the town but me, and it felt extremely desolate. I eventually realized that I was dreaming, and being afraid that I would miss Christmas morning, tried to wake myself up. I was opening and closing my dream-eyes, jumping off buildings, running into walls, anything to wake myself up. Finally, after what felt like hours, opening my eyes worked and I woke up, but it was such a strange feeling being trapped in a dream that I never forgot it.