I agree with the low lucidity thing. I find that in my gems of lucid control, nothing is impossible. But in my low levels I'll sometimes have the overpowering urge to fly as high as possible because I feel that someone is going to try and grab me from below. The most important and very first task that should be done at the moment of becoming lucid, in my view, is to ground yourself and increase your clarity. I make it a point to take in as much detail as possible and even review the basic concepts of dream control, even if I've done it a billion times before.