I am so uncomfortable doing side-lying, not if it's just for a feeding, but I usually fall asleep this way with the baby on the breast. My arm closer to the bed is draped across the bed (where my husband's pillow used to be!) above baby's head. Then I wake up with a burning pain in a diagonal across my back, due to the arm being stretched out in that way. Unfortunately I am such a heavy sleeper, I only wake up when babe wants more food, not due to the pain, so I'm stuck feeding her again in the same position, only to fall asleep in the same position, ad infinitum.
The only other way I can figure to sleep is to put that arm parallel to my bod, between baby & me, but that's awkward b/c it's in the way of the boob latching area. My back also gets generally tired from side-lying all night. I have thought about sleeping on the couch w/ her but that's a bad idea - I am freaked out that she'll fall off. I guess I am too lazy to want to get up every 2-3 hours, feed and then lay her down again. And usually she won't go to sleep that way anyway... she still needs the breast & active sucking to fall asleep much of the time. Any ideas?