Thanks.. Well I used the other half yesterday.. I actually only used 1/4 of the patch yesterday because of this reason. I remember reading somewhere in my pharmacy books that Methadone doesn't start having blocking effects until like 120-150mg; I forget. But thanks for the concern man.. When I feel a little sleepy I take the patch out.. That's if I decide to do it.. But since you've brought this to my awareness, I believe that I won't.. Thanks again..