I don't think it does. Mine did the same thing. I don't think you have to try too hard. Just let it be what it will be. If your mind wanders or you fall asleep or any other type of distraction...things will be fine. You are getting Michael's messages whether you are concentrating or day-dreaming or even sleeping.
Don't feel let down or disappointed, and I wouldn't compare myself to others. Your journey is your journey and it is unique.
Marilyn can really give you the answers and research to back it up, so she will see this and respond to you.