Oh boy do I understand how you feel!!! Part of the rebellion from the crew when we brought Magoo home was the peeing in the bed deal. That was all bad enough until one night I got the same treatment you got!! It's pretty disgusting to wake up to that! I knew why mine were doing it but I don't know what triggered Stash. Maybe he didn't like the fact that you messed up the routine by staying up. You know how they like routine! He is obviously upset about something if he doesn't have a UTI. All I can say is good luck! Mine stopped after they adjusted to Magoo but if Stash continues then I would get him vet checked before you start trying to figure out the behaviour issues. Hopefully it was an isolated incident!
What a way to start the day, huh?