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excellent question

let me first ask you are you taking insulin?

ok

for most diabetic people the most common reason for high blood sugar is inadequete insulin before dinner or bed time

however there are 2 well known phenomena that would cause the high morning blood sugar

they are called dawn phenomenon and somogyi phenomenon

The dawn phenomenon is the end result of a combination of natural body changes that occur during the sleep cycle and can be explained as follows. Between 3:00 a.m. and 8:00 a.m., your body starts to increase the amounts of counter-regulatory hormones (growth hormone, cortisol, and catecholamines). These hormones work against insulin's action to drop blood sugars. The increased release of these hormones, at a time when bedtime insulin is wearing out, results in an increase in blood sugars. These combined events cause your body's blood sugar levels to rise in the morning.

while somogyi phenomenon is a pattern of high morning sugars preceded by an episode of hypoglycemia (with no symptoms). Your blood sugar may drop too low in the middle of the night, so your body counters by releasing hormones to raise the sugar levels. This could happen if you took too much insulin earlier or if you did not have enough of a bedtime snack.

that would explain why you have high blood sugar in AM

to know exactly which one is causing that you may check your blood sugar between 2-3 am for several nights

if low then usually somogyi is the cause

if normal then dawn phenomenon would be the cause

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