In general my hips are not bothering me. However, I have been trying to sleep on my left side most of the time. It seems like that only works for a few hours before I wake up in pain. I usually then switch to my right side, but that usually ends up hurting too. Really, I just want to sleep on my back. Sometimes I wake up like that, anyway. I've tried putting a pillow behind me but I must move it in my sleep. So, my questions: 1) Is it really that big of a deal to sleep on your left side instead of on your back? 2) For those of you who have managed to master side-sleeping, what do you do to keep your hips from hurting?