You may have got very lucky and find you really are an examples of a metabolic body clock reset, but one day of extraordinary events, actions and consumption isn't the best way to drraw too many conclusions.
Well holy heck, it's just got more interesting.
Last night, again because my routine was out, I ended up doing something I normally avoid, and going to bed about an hour after eating carbs. Sure enough my bg was 9.1 when I went to bed (though this was probably near the top of a spike, so it could be worse. A few months ago 9.1. would be a good result even if I hadn't eaten for hours!). And it fell a bit by morning in keeping with how it usually behaves - I woke up with it at 6.9 (a more accurate reading as this was also a 3-measurement average, given it was the start of my normal carb tolerance test).
So the bad: I went to sleep with a poor bg and woke up with a poor bg.
Then the remarkable: I got the best score in my 34 gram carb test I ever have by a mile. At its worst, my bg at 2 hours is 2.8 mmol/l higher than starting. This time it was 0.5 mmol/l higher. Start = 6.9, 2hrs = 7.4.
Not only is the minimal rise remarkable, but it the 2hr reading is less than 7.8, which is what some people say to aim for for safety, even if you'd started much lower. My own goal is to aim for a 2hr reading of 6.2 or less as that seems to be the upper value for what truly non-diabetic people get, so I'm a long way from that.
However, and for once I'm going to be cocksure and make a prediction: so far I've been able to hammer my morning readings down within the space of a day. It requires a lot of effort and I usually do a huge walk after my last food at night, which may not be possible at the moment because everywhere is covered in ice. But I'm going to see what I can do today and tonight, and try to get tomorrows morning reading much lower than today's, which I *think* I'll be able to do. Then I'll take the same carb test again.
I may find that, since part of that effort will involve minimal carb intake today, my tolerance has reduced tomorrow. But either way it's really interesting data. And whatever is happening, my body is not the same thing as it was 3 months ago.