I've had this cool experience just now. went to bed at about 8pm-ish. woke up 3 pm-ish. napped 6-7 am. my awareness contiuned through the whole process of falling asleep, dreaming, then waking up. basically I suppose I was just doing WILD. the dream wasn't very lucid, though. I believe it may be good to analize the art of lucid dreaming through different characteristics, like awareness, freedom of choice, clarity, detail, memory, exc. like is done with meditation (concentration, clarity, equanimity... see Shinzen Young).