Your conscious mind cannot keep up with the exercise. I find it you're meant to do it consciously you will. Even when Paul has instructions, I just intend for my non conscious mind to handle it. Rather than worrying about listening for the instructions.
If I hear them then cool, my deeper consciousness has tapped me for my waking consciousness participate. If not then I'll trust that my deeper consciousness did as I intended when I put on the Paraliminal.
Paul has suggested if you habitually fall asleep make your intent something along the lines of, I intent to gain x from this listening session and while I am listening I may nap. When I wake up at the end of the session I know my mind is continuing to process all that I have experienced during the session. You can repeat the last part as you take the headphones off at the end of the session.
AlexK