All other things being held equal, I think that is true. If you're pre-diabetic and just using diet and exercise to control your blood sugar, you are helped a great deal with some native insulin. I know it's a problem if your pancreas is not consistent in its output. I take insulin via a pump, so my experience may not echo yours with regard to BG variability.
I find that my blood sugar variability tends to be "sticky." That is, low variability during the day tends to leads to less variable over-nights. Low variability nights, in turn tends to lead to low variability days. The opposite tends to be true, too.
Having said that, any number of things can change that dynamic. Restaurant meals can throw a curve. Extra exercise can change things also.
If I drink more than one glass of wine with dinner, I tend to go low in the midnight to 2 a.m. timeframe.