No-one's mentioned the other type of hypo i.e. Nocturnal Hypo's. None of my medical team has ever raised the topic and as I don't know of any T1's I've just had to learn/experience them on my own.
There is no sense of "Panic" (or "crashing" as I call it) and no sense of the "Zombie" urgency. My symptoms are fatigue and a complete loss of focus or I'm just a bit dopey. e.g. I might wake up do a test 2.5, hmmm hypo, wander into the kitchen to get something and "oh the plants look like they need watering" ... "oh I'm sleepy, better go back to bed". Or I've woken drenched in sweat the bed's soaked. Did I wet the bed??? No urine smell, ok oh I'm hypo ... oh, better change the sheets, oh I'm sleepy, just as well I changed the sheets ... and I "forget" to eat anything. Hmmm.
So in my experience I will find I've over slept by as much as 8 hours! (in some cases I've slept for 18 hours) ... and I'll have a "hangover from hell".
The worst case, actually my first case, I'd been skiing the day before so my body was severely taxed and standard glycogen release was being used for repair at a guess (I'm not a clinician). I got up and had been potting around for 20 plus minutes (dopey state), decided to have a bath and my last memory is turning on the hot tap ... woke up in bed, confused and in severe pain .... huh? my skin is falling off????
Short story is 3rd degree burns on 20% of my body, 6 weeks in hospital, skin grafts etc ... Doc's all said "he had a hypo", which I vehemently disagreed with, because I'd had a "hypo" before ... just not a Nocturnal Hypo. It took me 25 years to realise what had actually happened as I believed I must have slipped and banged my head (though I never could come up with a reason as to how/why I got back to bed).
None of the Doc's then, or anyone EVER since, has explained/discussed to/with me the symptoms of a nocturnal hypo.
If you wake up drenched in sweat, you're Hypo! If you find yourself "pottering" e.g. had been going to do something but got distracted (though the chances are you won't notice you're distracted), Check your BG as it's likely you're hypo. Especially relevant/likely if you've had intense exercise the previous day.
Hope this helps.