Trouble with sleep...

Diamond

I need help I can get comfy and no matter what I try I always wake up on my back. I was originally a stomach sleeper before pregnancy so now that my body has been trained that's not an option at the moment, my back is my next resort. I have also been waking up with cramps around my abdomen and extreme heart burn. Do you lady's experience any of this? (I'm 35 weeks by the way)