Diabetics probably sleep through mild night time hypo's than they realise, where the blood glucose levels drop just below the 4mmoml/l mark but return quickly without harm the change in liver out put...
And yes your liver can pull you out of an hypo you sleeping through, I used to do this the indicator that you've had tad more than an very mild hypo during your sleep and your liver has bailed you out of it... Is when you wake your BG is higher than bedtime normally by quite a lot, and you feel like you have a major hangover, in my case it used to blitz my eyesight, it would be like I was looking through a very dark, thick dirty net curtains and this would take up to several hours to ware off..
In most diabetics the liver will adventually kick in and dump the liver into the blood stream, but the longer you are out the worse you feel when you start to come around, but is one of the very last safety nets, not really a good idea to rely opon,as it is dependant on several factors.. The balance between the excess insulin in your body, what the liver is deliverying, and what stores of glucogen it has...
If the amount of excess insulin far out weighs the amount of glucose, it could be fatal before the liver decides to dump..
If you've had hypo's previous 24 hours, your glucogen stores may not have been replemished enough to be effective..
If you still have alcohol in your system, you won't have a glucogen store to dump and no glucose being delivered to constantly top up your BG... Liver can't process alcohol and maitain glucogen storage and delivery at the same time.. So concetrates of processing the alcohol, which it does at about 1 unit per hour on adverage...
Me I am very lucky now, not only having a pump but hypo back up, with 2 dogs that we wake me if they sense my sugar levels getting low..