hey!

My body pillow is amazing!!!! I use it so i can sleep on my side comfortably.. My back hurts waaay too much from sleeping on my side unless i have my pillow to lean on.
What I do is lay on my side with my leg over the pillow and it helps keep my hips squared and stops my spine from twisting,

I got mine from Pillow Talk and it has a foam core (highly recommend!!!) the stops it from going lumpy and gross, I had a k-mart one before that went lumpy in a week so was CRAP!

HIGHLY recommend them if you have a sore back!!! Soooo much more comfy to sleep!