That is exactly how I sleep and sometimes my shoulder does bother me and I wonder if its from sleeping that way also. I cannot sleep any other way though either. I have to go on my stomache with my arm under my pillow/head to sleep. Maybe firmer higher pillows that are comfy without your arm under the pillow may help you find a new position to sleep in. I dunno! If you do find something though let me know cuz I need help with that also!
