There are several things that could be going on. The first is called "Pre-Dawn Phenomena". Secondly, it could be that you system has not had time to adjust to the Metformin. Thirdly, it could be that exercise, after your evening meal, would help. There is a lot of info concerning this in the T2 "Blood Sugar 101" thread. You may want to have a conversation with your doctor, as well.
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Regards;
Danny 
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