As said don't try to focus on either voice. If you find yourself attracted to one side or the other for a while that's find. Just listen down the middle relax. If your conscious mind wanders off or takes a nap so be it. The non-conscious mind is supposed to be doing the listening anyway. When you wake up at the end of the Paraliminal it's a sure sign that some part of you was listening. Occasionally you'll hear yourself say I don't want to wake up or get up and might continue to sleep.
Set your purpose for listening and notice what happens. I recommend keeping a journal of your listening and the purpose. It's very easy to overlook the changes that start taking place.
Alex
