@NatureOrbs - 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.
My dawn phenomenon (aka DP) is now at the point where at 3:30am, my basal pump dose increases from 0.3U per hour to 1.5U / hr. Even though I pump, I now need to awaken at 4am to check BG and decide if I’ll give myself an additional 1.5Unit or 2.5Unit bolus of Humalog.