My shoulder

So...I hurt my shoulder sleeping last night. Yeah, that's right, sleeping. Does that mean I'm getting old? I think that means I'm getting old. It's not the first time I've hurt various body parts this way either. And it's not like a "oh, my shoulder is a little sore" and then it's better after an hour sort of thing. This is a can't lift my arm past about 30 degrees up for like 4 days sort of thing.