I agree my Metformin and other meds have printed on the bottle do not operate machinery when taking this medication may make you sleepy.
For some high glucose can cause one to be extra sleepy but not everyone has such signs.
I could be your meds, it additionally could be if you are depressed.
Also check your meds. They msy make you sleepy.
Yes, high blood sugars will do that to you, where all you want do is sleeeeeep