If you find yourself in the state at night when you still know you are in bed, but not sure if you are quite sleep/dreaming or not... (happens to me all the time) perhaps you can try what I did to have my first LD.
I went to be with intent to LD and didn't think about anything else. For the longest time I was in and out of sleep, in that funny sort of conciousness, and wasn't sure if I was awake or asleep because I could feel myself in the bed still... So I decided to TAKE A STEP AND GOT OUT OF BED! and voila! I was in my dream! left my sleeping real body and started walking away in my dream body (and what a fantasic and almost mystical experience that first LD was!!!).
If you try it next time and successed, I'd like to know about your experience.

Sweet dreams.
IDreamtofU