Oh wow. I had my first LD last night, and that is EXACTLY what I did, well, at least very close. It acn get extremely psychologically tiring to think "I am dreaming" over and over.. (try it now, I doubt you will even think it 50 times, without getting too exausted to finish)

Anyway, my .. technique, only used once, is to bolt upright when I feel I am about to fall asleep, and quietly say "I am dreaming". Also.. Caffeine induces ludcid dreams I've heard. Drink a can of (preferably diet because it doesn't have sugar) pepsi or coke 30 min before you go to bed.