I don't have bursitis but I do have arthritis in both my sacro-iliac joints (the bit that hangs your leg bones off the rest of you). When I sleep (usually on my side) I put a pillow between my knees, this relieves pressure on your hip. It may help, my sister-in-law has a back problem and she does this too. I custom made my pillow to get the right "plumpness" ....hand appliqued and quilted of course:)