My daughter knew someone with a service dag who could detect either hypoglycemia or seizures. I don’t recall which condition, but I’ve heard of cases where animals can detect that kind of thing.
Best thing to do is watch his behavior and record every instance of when he acts like that and what her blood sugar is. Having a record will help detect a pattern if it’s there.
It’s far better than trying to rely on memory.
Good idea...she just went to bed, and that particular kitty just went up the stairs to join her.