Actually I did it by accident, it was really really hot and I just didn't mentally fall asleep, my mind was wandering and when I took a look at the situation I noticed that I'm not in bed anymore- LD...
It's the same idea the WILD technique uses - basically staying aware utnill your body falls asleep. So you experience the whole transition from waking to the dream state. I haven't induced a LD like this yet, I just had an accidental one again .