I can still sleep partially on my belly...I have a body pillow between my legs 'cos my biggest sleeping hassle is pain in my hips if they're out of alignment. I sleep with my head to the side, and body half on my tummy, half on my side.

When I'm studying - I like to read while lying on my tummy. I can still do this if I get my body pillow and wrap it around my tummy, making a hole for it to fit, and I lie on that IYKWIM!