I feel the same way right now. I dread going to bed because DH falls asleep right away and I toss and turn all night, literally only sleeping an hour or 2, then getting up so tired and irritated. I can sleep on the couch, and I haven't taken to sleeping there at night, (I guess I don't want to admit defeat)
Anyhow I have no idea what to do. I've tried various pillows and different arrangements, but what it comes down to is a can't get comfy. If I sleep on my side my hips scream. I can stay modified on my belly, but only sometimes and only for a little while until it hurts. I can stay on my back for a short while, then my back hurts. It's never ending. I feel like if I could just relax I could sleep, but I can't and I'm so tired.
Then to make everything better, my in laws are here, and I feel like I am being run crazy. Making 2 HUGE meals, making sure everyone is happy and satiated, sigh, not to be done when in the last part of pregnancy. AHHHH.