I'm normally extremely moody (actually they call it bi-polar) but my moods are in no way related to what is going on in the world around me. They just change for no apparent reason. Over the years it has been very puzzling trying to figure out why I was feeling like I did. I think, for me at least, alot of it is subtle chemical changes in the brain. I say "normally moody" because right now I am not at all moody, I'm as stable as can be thanks to some excellent psychotropic medication!