Wow!!! I think he's enjoying being a man of mystery - I see you got that bedtime check in last night, so what did he do? Wait til tonight to throw a wonky PS! ohmygod_smile
I think I'd be tempted to lower the dose a bit and try to get a better idea what is going on. Since you switched from M/D to FF (did I get that right?) I'm thinking maybe his insulin needs have changed/gone down due to that?
Regardless, it's nice to see a blue # - you know there is an answer in here somewhere! I'm sure you'll figure it out as you get more data.