Dude, all my lucids come from this method. It totally works. I don't do it so often, I feel like its more of a spur of the moment sort confidence thing.. but I'll give it another shot tonight ay.
Like once I had my sister over, and I let her sleep in my bed while I slept on a matress on the floor, and I thought how funny it would be if I had a lucid on the bed on the floor, and I spose an instant of a moment with the idea, the visual of lding in that bed on the floor shot through my head, and that night I had an LD.
So yeah, its just these quick thoughts of absolute confidence. Seeing the bed your gonna sleep in before you jump in, visulising the idea of you LDing in it, then dropping the thought and falling asleep. It works for me. :)