Most people know that muscle and joint pain, particularly in the lower back, can be linked to chronic sitting, a weak core, lazy glutes and poor form in the gym. But the very thing that is supposed to restore and regenerate our bodies (sleep) can also contribute to pain and injury. Poor positioning of the legs can further compress already tight hip muscles. Twisting of the spin or pelvis can cause fussy muscles like the quadratus lumborum to become hypertonic. And acrobatic-like arm contortions can cause nerve pain. I asked my physical therapist and friend what the "best" position is for sleeping for most people.