@Karen551
There is dawn phenomenon, DP that will cause your BG’s to go up before you wake up.
Some people deal with this with a fast acting shot of insulin to bring it down when you first wake up, . I am on a insulin pump so I have it set at a higher dose in the early morning hours.
But it will also make you insulin resistant from a hormone release for a few hours when you get up.
Jim_in_CalgaryType 1 or LADA
Carbs (or glycogen released by your liver at around 4am) are not the predominant cause of early morning rise in blood glucose.
Your body has an adrenal release (it secretes higher levels of growth hormone, cortisol, glucagon and adrenalin). These effectively increase your short-term insulin resistance, after which even normal low levels of glucose in bloodstream cannot be neutralized.