I have been uncomfortable for weeks I'm 31+ right now. Part of it is my bed but even with 2 pillows and body pillow I toss and turn and have to switch sides halfway through the night. Only thing that helped was sleeping with one of those big reading pillows so I am almost sitting up with 2 pillows under my back and body pillow under my side.
I'm 27wks. I tryed sleeping on top of pillows. That worked for half the night till she decided to start kickin and movin around like she fighting somebody.
How far along are you? I'm 35w1d and I've been really uncomfortable sleeping since about 31 weeks. Baby moves into the ribs causing pain, belly is larger causing pain, hips separating causing pain when rolling. The bigger you get the more uncomfortable it'll be to sleep no matter what you do. You could try a wedge under your belly along with a pillow between the legs. If you're early it could be your mattress but if you're further along, I'm sure it's just the pregnancy.