My 8-month old son (born at 30 weeks, so not sure if the preemie factor needs to be considered, but generally he is developmentally close to his birth age) will NOT sleep on a flat surface on his back. He won't sleep in his crib - the few times we get him to sleep in it, he'll sleep for maybe an hour at most, usually closer to 30 minutes. Once he wakes up, he screams when we put him back in it after nursing or soothing him. We had previously been sleeping him in a Nap Nanny Chill, and he sleeps well in his swing, and when he wakes me up to nurse him, I usually cosleep with him. But, he's starting to roll, and I know he can't sleep in the Nap Nanny once he's rolling, I'm afraid he'll roll off the bed, and I want him to get used to sleeping without me. He won't sleep in his pack and play and he won't sleep in his crib, and not a blanket on the floor, either. Looking for suggestions that worked, other than cry-it-out, and he won't stay in a swaddle any more. Please, advice!!