DD is 6.5 months old an she is tall and heavy (20lb 28 inches) we do most of our nursing in the side lie b/c it is the most comfortable for both of us though I do like to sit with pillows behind me and one under my arm if she isn't crying already and I can set it up before our BF session.
She nurses almost constantly throughout the night but I will wake up and unlatch her and get on my back if I can. I am a back sleeper and side sleeping is uncomfortable for me. I was sucking it up but yesterday I woke up with a completely stiff neck. We were camping and it was a road trip and I leaned over DDs car seat to nurse her in a pinch a few times on the drive so I know that the past week has been exceptionally hard on my upper back but I was already feeling it before this in our regular bed.
I don't want this to happen again. I have 3 inches of memory foam on our pallet bed (a full sized modular fold out couch that is basically sewn together couch pillows) on the floor. I sleep with a flat pillow under one hip sometimes but I have to keep moving the pillow back and away as I change positions in the night to get my good deep sleep on my back. Most of the time I am too tired and just end up getting most of my sleep on my side and waking up feeling like I need a nap.
So, what are your tricks for BF throughout the night and getting quality restful sleep that doesn't throw your back out?
I'm seriously considering more memory foam.

Re: Any tips on co-sleeping and O/N nursing?
I've found that a pillow behind me that I can lean back into a bit while still lying on my side to nurse helps.
Some nights she barely nurses an will roll away and cuddle up to her dad or spread out on her own but most nights she is attached to my breast. I think she just needs the comfort most of the time. I think she knows other ways to soothe herself but most of the time the breast I her favorite.
Me-36, Unexplained Infertility, DH-35, all clear
Clomid 50mg 12/2011 = BFN
Clomid 100mg 1/2012 = BFN, with Cyst
IVF #1 Lupron/Menopur/Gonal-f/HCG Trigger
ER 4/19/12 = 11 retrieved, 6 fertilized,
ET 4/22/12 = 2 transfered (day 3), remaining 3 weren't good enough to freeze
Beta 5/3 = BFP, 87 Beta #2 5/7 560.9 Beta #3 5/9 1376.5 First u/s One Baby, 125bpm!
Second u/s, 176bmp! Kicked over to the OB by the RE at 8w. Team Green!!
I think I'll get a massage for this stiff neck and try adding more memory foam and yoga when I can and neck stretches too. More onto my already hefty todo list but ces't la vie!