An interesting side effect?

I just had an incredible weekend of personal growth, however I have been noticing something rather interesting that may possibly be a side effect, or may be something else.
I can't remember if I have mentioned this before, but I keep finding myself closing my eyes. I eat a delicious sandwich and my eyes close. I sing a song and my eyes close. I spend time petting my cat and my eyes close. I just keep finding my eyes closing at times when normally I wouldn't close my eyes.
Its weird. I don't really know what it is from. It definitely feels weird though. If this is all I have to deal with right now as far as side effects go, I will happily deal. So far my current med combination has lasted the longest with the least side effects. If this is a side effect it isn't so bad.