@babarn - again, you're right about the piriformis muscle. That has given me fits in the past, and it still does. Actually I'm having an injection to try to determine if the primary residual pain I'm still having after lumbar surgery is more in the hip or the piriformis muscle. That pesky area, when inflamed, takes forever to settle down again it seems. I used to do yoga and loved it since it helped me stay flexible and some of the poses did stretch out that muscle. However the lumbar surgery has made my spine rigid enough due to the hardware there that I can no longer twist. My physical therapist gave me exercises to strength the muscles around that area, and I think it helps. Sometimes sitting on a too-soft chair will make it start to ache ("it" being the hip or the piriformis, I'm not sure which) and those effects can hang around for several days. The Sleep Center doctor also said any pain or trauma below the waist can make RLS more intense.