I am thinking...Hmmm...there are times that I fall asleep on my back and end up thinking, well, sort of sleeping and thinking, usually making me tired. Other times, I don't even know that I am asleep. That is very strange. I used to sleep on my tummy , my favorite position! Then, because of my back, that wasn't a very comfortable position. Or, maybe, it is the kind of pillow. Thanks! I shall investigate...