In regards to people worried if Gravity would be the same in their dreams so that it makes the RC useless, I asked NyxCC about this in my Workbook. The response I got was that if you expect the Gravity to be the same and you're worried about it, then it will be the same. But if you expect the gravity to be different, then it will be different. It is the same concept with other RC's like the nose-pinch and the counting fingers.

I think it has everything to do with your expectations.