Not quite sure where to put this, but I have a problem when I sleep on my side. After about an hour of sleeping on my side the gluteus muscles hurt. I don't know how to explain it but I guess it's a dull ache. If I switch to my other side after a while it feels the same. I'm not very comfortable sleeping on my back or stomach so this is a major concern spending all the time on a sleeping pad during a thru. After a couple nights the pain doesn't go away during the daytime and immediately appears again when laying on my side. There have been a few times I haven't had the problem, but I don't know what it is or how to prevent it. Is it something I can prevent by stretching? Sleeping a certain way? Any advice is appreciated!