| It's an interesting question. As for is that low enough to get a liver dump, I really can't say. There will be theories out there but your body may well be unique. Here's where basal testing or testing hourly or 2 hourly under controlled conditions is good for, you not only see the point you are at, you can see a trend.
So, maybe next time you see a reading and suspect it might be low enough to set off a liver dump, be sure to test over the next few hours to see if there is a definite rise, apparently in reaction to the low. You might be able to better answer the question, then.
I know what you mean about your concern with going low while you sleep, but don't forget your body generates and meters out it's own energy all the time, and not just in the form of emergency liver dumps! The fast overnight shouldn't automatically increase any kind of risk of hypos for a non insulin taking type 2. Of course, there's that "shoudn't", a subjective term, and here's my further clause, that I have very little experience dealing with type 2.
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−− Type 1 since 1991
≈≈ MDI with Levemir and Novorapid / MM 722 Pump since 2007
~~ Metformin ER since Sep 2009 | 
