[spring]

I had that happen three times in the past.

The first time was rather frightening. I didn't seizure and I could walk okay but my brain was quite messed up. I was only able to formulate (a rather articulate phrase all considered) "I can't think properly". I tried to test my finger but couldn't work out how. It was difficult to coordinate and my brain couldn't put steps together. I woke my parents (I think I was about 15 at the time) and declared my inability to think. When my mother tested me, I was 4.9mmol/l. A perfectly fine number! I nibbled on breakfast but still couldn't think right or read or speak more than odd words. It took about 45 minutes for me to get past babbling and into mostly coherent sentences... at which point I started puking.

When we finally got to the hospital maybe an hour and a half to two hours after I woke in that state, the Dr. there smiled and said that I must have dropped in the night, but judging from my morning number and puking state, my liver had saved me and brought me up. (Converting stored glycogen into glucose - go liver) That was likely the case for you as well - hence why you weren't horrifically low when they tested you. For the rest of the day I had a bad headache and was a bit queasy but three hours after I was fully functioning brain-wise.

The second time it happened I immediately recognized what it was. I was more mute that time and couldn't get a straw into a juice box but I had a ziplock bag of life savers next to my bed that I managed to pry open and devour. Woke the parents up again but didn't go to the hospital as my bloodsugar was fine and eventually I was back to normal (though again, puking and with a headache from the liver's glucagon kick) The third time was much the same.

It is scary and for several years I let myself run higher than is proper before bed/would have excessively large evening snacks for fear of it happening.