Possibly you have a strained tendon or ligament, but it is also possible that the weight of your body is too much for your shoulder muscles to easily bear. If you do not have trouble with your arm other than in this particular circumstance, then don't sleep on your side. Try a dorsal or ventral posture. One of those is very likely to work for you.
there is no ''Pain in upper back.''
see a doctor
Its probably because either you popped your shoulder out of place or the pain signals are to painful making you stay awake to worry about it.
Stop masturbating, champ.
streching da
Upper left
Usually in the liver in the right upper quadrant of the abdomen.
Sciatica.
theraflu
Kittens
Most likely a gallbladder attack.
i have pain upper right side below ribs,also lots of tenderness in back right side.