just before i got my insulin pump in 2013 (my old one had completely died, i didn't have health insurance, and my 2013 ADA deductible hadn't been met (the $8000 insulin pump took care of that), i lost just over three hours while sitting at my desk. apparently, that was enough time for my liver to kick in and get me glucagon. i ended up on the floor, across the room, and fractured a bone in my right thumb (didn't find that out until the thumb swelled up to twice the size; the cast was on for six weeks as a reminder).
ironically, the first thing i did upon waking up was to grab the jar of glucose tablets on my bed and stuff a fistful in my mouth...i don't know why as i hadn't tested and had no idea what was going on, but my brain knew better. by the time, i did test it was about 80. i will unlikely never forget this event. and it hasn't happened since then, thankfully.