I remember too. And I had a "pregnancy cold" the whole time, so I could never fall asleep. I did end up borrowing a recliner, even though we didn't have room for one. It essentially fit halfway into my closet, but it fit :) Earlier in my pregnancy, I could sleep with a pillow between my legs, and another one to support my belly, but as I got bigger, even the recliner was not awesome. I would hang my belly over the armrest and try to cuddle into the corner crack of the recliner where the back and armrest meet. Yeah, nothing worked awesome, except complete exhaustion, which is when I fell asleep, no matter how uncomforable I was.
It's hard to complain too much about the recliner though after spending a week in the hospital on a break-away labor bed!! They finally moved me to a regular hospital bed... I guess they were just so concerned I was going to go into labor at any moment and they wanted to be ready. But seriously... it was torture.
I could never sit up either, but the recliner worked better than that, and it was my best option. Good luck!