Its so hard to sleep!!

I know your ment to sleep on your side, but now that my pubic pain is getting worse its hard to stay up on my side, i find i roll forward onto my tummy a bit- then bubby starts kicking and i move back. The last week ive woken up to find that im sleeping on my back! Its the most comfortable position for me but ofcourse its not ok to do this..... so basically i spend the night tossing and turning (very slowly might i add due to my huge belly and so soo sore pubic bone) and i dont really get that much sleep at all.