RCs have worked alot for me. Commonly, I'll notice something in my dream world that just isn't right, so I RC and then I know I am dreaming.

Also, I have been with my friends and was just joking around saying, "Man am I dreaming?" I then laughed and nonchalantly did a nose pinch RC, only to find out I was really dreaming. I couldn't believe it, so I did like 20 RCs and finally i had to accept it. It had seemed so real.

Here is a tip that I used to use whenever I did RCs during the day (don't need to do them now). Whenever you RC during waking life, look around at your environment and actually pretend it is a dream and not real. Actually convince yourself that you may be dreaming and then perform the RC. This will help simulate a similar experience in dreams. Good Luck!