Sometimes waking in the night can be due to low blood sugar.

Try and have a balanced snack before bedtime, and see if that helps. A clue might be dream content, or rapid heart rate also with the waking. Low blood sugars are common during the night and indicate insulin resistance. Disturbing dreams or frank nightmares may occur with impaired glucose metabolism.

Have you had your glucose checked...fasting? Was it really low?
or was it borderline high? People on the way to type II diabetes may have YEARS of impaired glucose handling.

A snack with some protein, and moderate carbs may help if this is your problem.

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