It just started not being iffy the last couple of days. In fact, my partner commented this morning that I slept on my side. Otherwise, about a month in, I was able to sleep partially on my side. Hard to explain, but I was half way on my side, half not, if that makes sense.
How about when sleeping on your back, putting a pillow under your knees? That helped me a bit. Also flip your mattress plus maybe sleep on the opposite side of the bed. Sounds weird, but finding a softer spot or a harder spot may help (it did me) garramone specifically tells you to not sleep on your side for 3 weeks, so it isn't just a co.fort thing. Although for me it was too painful to sleep on my side anyway ( if I rolled onto my side while asleep, the pain would wake me up), consider if it is actually worth it if it would actually effect the outcome of your healing/results.
GIn terms of the cold, did you get free nipple grafts? With mine being nipple grafts, I do not feel the cold, however, pretty quickly after surgery my areolas could feel touch. I don't know how much sensation does come back with nipple grafts, I guess it depends.
Glad to hear you got a chunk of work done prior to your surgery.