At 36 weeks I'm just now starting to experience hip pain at night that is enough to ruin my sleep. Last night, I created this pillow sculpture with several under my knees (I'm tall) and several under my back so that I was elevated...got all kind-of-comfortable, and then started worrying that I wasn't sitting up enough and that if I fell asleep I would stay in that position long enough to compromise the baby's oxygen. I rationalized in my sleepiness that I would feel uncomfortable (as I do laying completely flat) if I was not sitting up enough. Then I worried myself onto my side, and laid awake waiting to feel the reassuring baby movements that I hadn't suffocated him. I realize a lot of this is half-asleep delusions...but really...how elevated do we need to be to be considered "not laying on our backs" where there are negative consequences?