As stress affects my BG and stress affects my sleeping patterns, I often find my BG is "off" when I am not sleeping well.
However, I couldn't tell you if this is because I am stressed or because I am not sleeping well or both.
And to add to the mix, if my BG is "off", I don't sleep well.
I guess it's a question of which came first: the chicken, the egg or the coq au vin?
If you can find the route cause of your sleeping problems, there is a good chance your BG will improve.