| Your high BG may be due to either the dawn phenomenon or the somogyi effect
The dawn phenomenon is your body's response to the hormones your body naturally releases in the early morning hours (everyone releases these hormones in the morning). These hormones cause the BG level to rise, and if you don't have enough insulin at that time or if you are highly insulin resistant then you will have a high morning BG. To minimize the rise, you can exercise later in the day (to hopefully lower your glucose rise or increase your insulin resistance), adjust your meds (of course, after talking to your doctor first), limiting bedtime carbs and possibly eating some protein snack and eating breakfast as soon as you wake up to tell your body to stop releasing those morning hormones.
In the case of somogyi effect, you experience a hypoglycemia during the night (well, typically between 2 to 4 am) followed by hyperglycemia - it is the high numbers of the hyperglycemia that you detect when you wake up. You can correct this by having a snack with protein before bedtime, going to bed with a BG level slightly higher than usual, or adjusting your medication.
I suggest checking your BGs through the night for 3 nights to trace the rise of your BG and spot any trend, which will hopefully help you know the possible cause. The best way is to check your bed time BG first, then for every hour thereafter until the time you usually wake up.
Taking metformin is also helpful, based on my experience and other DF members' experiences.  | 
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