I don't actually seem to use RCs in my dreams to become lucid. I do RCs during the day, but in a dream, I just know that I'm dreaming and have no need for them. However, in my most recent LD (I wasn't very lucid at the start of it), I thought "Hey, I'm dreaming here, but I should probably do a RC just to make sure." I then started to pull some grass out the ground and I thought, "What the hell am I doing?" The dream then became more vivid and I was more lucid, but I thought that was very weird.