The thing is, your mind should NEVER be in the "don't fall asleep/let your mind wander" mindset. I know what you're trying to do--stay focused so that you don't fall asleep normally and you stay alert for the transition. But what you have to understand (and convince your brain) is that in order to WILD, you have to fall asleep. You'll just be conscious for it. But you have to convince your body to sleep, and if your mind is active and constantly swirling with "what's that feeling?" and "this could be SP" and "stay focused don't sleep," you will probably not get anywhere.