Shelly,
In all seriousness, in addition to the sound advice given in this thread the only battery that you ever need to be really worried about is a 9V battery. I'm honestly surprised that they still exist in their current configuration. The proximity of the terminals and propensity to short out in multiple situations, including disposal, is actually something to consider.
But AA's? Just toss them and forget about it. But that said, we do lots of things in life just to feel better about something so if it'll give you a little piece of mind my advice is to wash the sheets and rest easy.