I'm 25 weeks now, but I've had this same problem since probably around 12-13 weeks, way before ever showing. Every night I have pain in whatever side I'm sleeping on and by the end of the night, I can't stand to sleep on either side (and since I can't lay on my back, that pretty much ends sleeping for me). Sometimes I can alleviate this by sleeping on a pillow and using a pillow between my legs. But, sometimes that doesn't help either.My doctor has suggested taking Tylenol for this, though I really don't want to have to take medicine all the time. She also said I could invest in a memory foam pad or even a mattress (I wish!), but I have yet to try something that costly. One thing that does seem to consistently lessen this discomfort is yoga. When I really stretch out my hips/legs during the day, I find that it takes a lot longer in the night for my sides to start hurting, and the pain doesn't get as severe. In contrast, if I'm on my feet a lot, I end up having worse pain in the night.Good luck!