Ok, now that DD can roll every which way, she only is sleeping on her tummy. Last night I walked in and her face was straight down on the mattress. She was breathing (I have no idea how) but it freaked me out. So I didn't sleep much last night. She normally has her head turned to one side or the other. Has anyone else come across this, and what did you do? I can't keep her off her tummy now that she is so active...