Hi Libby.....hey Hershey, knock it off! You stressed mom and dad enough last night, quit being a drama-cat.
The high numbers are a combination of a couple things. One, he hasn't had any insulin for 18+ hours, so nothing is fighting the boost from eating more than normal amounts since he went so low last night. Also, part of it is a bounce from those low numbers. Impossible to tell which is having the biggest effect.
There's no rule that says you have to wait until +24 to shoot. We normally tell people to do that so that they can maintain the same shot schedule as before. But once you get past the 18 hours since the last shot point, you only have two choices. Either shoot then, and adjust to a new 12 hour schedule, or wait it out. In theory, you could shoot a tiny dose, then pick up at +24 to keep on schedule. But then you have to shoot a tiny dose then as well. You also have two different doses of insulin in his system at the same time if you do that, and while the first is peaking, the 2nd is just starting to kick in. That, IMO, can be dicey, because you could have "too much" in his system, and you repeat what happened last night, but the timing of things is a nightmare. Plus in your dose decisions, you have to consider the "post hypo sensitivity" factor.
I would wait it out, At +24, I would shoot a normal .8 dose, or maybe a tad less. But by then, all the extra carbs from last night, and all the insulin, would have cleared. You don't shoot a higher dose just because the BG is really high. You would expect it to be really high for the reasons mentioned above.
If this ever happens again, where you have to skip due to a low number at the normal time, you could shoot at +2 or +3, with a reduced dose, if you are planning to shoot the next shot at the "normal" time in the evening. But once you get into the +6 time frame, you run into the whole insulin onset, nadir, duration time nightmare I described above.
Hoping that isn't too confusing...
Carl