I agree with most posts...however if something particularly weird happens I will do an RC and think there is a possibility I am dreaming. I am 80% sure I am awake but try to leave 20% doubt, since I know in dreams I also think I am awake too. Early this morning I had an LD. I couldn't find something that should have been right where I put it a few moments earlier. After fuming a bit I thought "this is not possible. Maybe i am in a dream." I did an RC and then had some fun when I knew it was a dream. Well, I almost didn't, as I first tried to fly and fell on my butt. My wife gave me a funny look like "what were you THINKING?" and for a sec I had some doubt. But then I said "I've got this" and floated in the air and told her "see, I AM dreaming!" and took off.

Well, interestingly, last night earlier in RL I lost my wallet when I knew it should be where I had just put it! I also panic 'ed and raced around looking for it. I did an RC with my 20% doubt, but was indeed awake. Fortunately my son-in-law found the wallet. But the point is, leave some room for doubt even though you KNOW you are awake...otherwise you could miss an opportunity to be lucid.