Yes, I've noticed it with myself, too. It's most noticeable at night for me......because I'm trying to relax and fall asleep and it seems like I'm constantly taking deep breaths. I do it, too, during the day but I guess I've got more to distract me then so it's less noticeable. I get that tight constricting feeling in my ribcage. I guess it's just part of the MS fun we all have!