Well, I was going to try going back to sleep. Till I realized there was a leak coming from the toilet tank (only made possible cause I dropped one of those blue tabs in there yesterday) when I found a big blue splotch on the floor. Looks like one of the screws that was holding the tank down was loose and was letting a very slow drip down to the floor. Would have never noticed it without the blue. Tightened everything up, mopped up that spot, and now we wait to see if it reappears.