Sounds scary, did they say if going to investigate why his blood sugar was low and if they were going to monitor it to see if keeps doing it? I hope it was a one off and he is ok x
Like you say if he has lots of sugar it seems odd it was low but I have wondered if I have had low blood sugar at times even though I have sugar in tea and eat quite a lot of sweet things.
About 25 years ago I kept going a bit funny would suddenly go really shattered and feel like I would just go to sleep, I'd just sit there sort of awake but struggling to focus and stay awake. I used to have a drink of lemonade or a suck a mint or something and try really hard to focus and after a little while it would pass.
Then I had a little fit one day while eating my dinner and another a few weeks later just after I had been to the loo I had another. One minute I was standing in front of loo flushing it the next it was half an hour later, I was laid on bathroom floor facing completely opposite way at the side of the loo and the cat was licking and nudging my face. I went to drs next day had load of blood tests and was refered to hospital and had an eeg which didn't show anything but with hubbys description of how I'd been when he was with me and how i described what happened when had other one in bathroom they said it was a fit.
Dr explained how sometimes our brains become overloaded and its safety mechanism is to shut down for a short time and that was when I had the fit. He said a lot of people can have a couple of fits in their lives at times of stress,without it needing treatment, He said if I had had 3 fits close together they would say epilepsy and refer me for treatment but as I had only had 2 they would put it down to stress for now. At the time I was working lots of overtime and we were selling and had moved house and I was decorating on the day of second fit.
Now I do sometimes wonder if my blood sugar was low and that had caused it. When I'd originally gone to the doctors for my blood test the dr said my blood sugar was low right on the cusp of being considered too low but as I had not eaten since the night before it was probably because of that. I didn't say anything to dr but I didn't know it was a fasting blood test as no one had told me so the morning they took blood I had a cup of tea with two sugars and full fat milk, a bowl of frosties with milk and two bourbon biscuits and I'd also had a cup of hot chocolate made with milk and a piece of shortbread the night before at around 11 so I was surprised it was so low but didn't let on as felt silly for eating before test but afterwards wondered if I should have said so. Although the hospital did blood tests too and didn't say snything bout them.
The last year or so I sometimes get that feeling again that I will just drop off to sleep and struggle to focus on whats happening and stay with it. Hubby notices it sometimes and will start calling my name and I can hear him but struggle to answer him. It doesn't last long luckily but I do sometimes wonder if its a drop in blood sugar or something, although the amount of sugar I have it would be a surprise as like your dad I like sweet things. I don't know if you can eat lots of sugar and still have low blood sugar and if so what causes it.
Anyway sorry to ramble on but I don't know if its linked to your dads dementia, it might not be, maybe it was a reaction to some other medicine he is on in hospital. Hopefully it was a one off but it may be something that needs watching so hopefully while he is in hospital they will keep a check on it.