Upper right chest pains

I am only 19, I am of normal size and weight for my height.  Lately while i am sleeping i wake up to pain in my upper right chest.  I do not have any idea where this is coming from.  It seems to be alleviated when i sleep on my back but that is not comfortable for me since i alwyays sleep on my stomach.  It seems to happen as i am breathing in and only when i am sleeping.  Any clues?

[National Jewish]

Pain of this nature can be from muscles, nerves or the lining of the lung.  It is not very likely to come from your lungs themselves.  You may have pinched a nerve in an activity or even in your sleep.  I would take mild pain medicine and if this does not take care of it or it gets worse, I would advise seeing your doctor.