Your body prepares to wake up by releasing certain hormones, these hormones prompt your liver to release some stored glucose into your blood.
It happens to everyone, diabetic or not, the pancreas releases some insulin which allows the glucose to be used.
People with diabetes have trouble using that glucose either because they don't have any, or enough natural insulin, as in the case of T1's, or they are resistant to the insulin they do produce (T2's)
There are lots of ideas around for somehow stopping your body from doing something it has evolved to do, and has been doing the whole of your life. Such as a glass of wine for bed, some protein or fat for supper or even 1st thing as you wake. You may have a little success with these ideas but to be honest you will be improving nothing.
The problem for T2's is not the dawn phenomenon, it is our ineffective insulin or our insulin resistance that is the real problem.
A glass of wine or piece of cheese at night is not going to fix that.
Every time you eat, your pancreas releases insulin to deal with the carbs, the more carbs you eat, the more insulin is released. Your pancreas will continue to produce insulin as long as your blood sugar levels remain high. With lots of insulin circulating around your body, you become less sensitive to it and your insulin resistance gets worse.
The answer is to reduce the amount of insulin by eating fewer carbs and less often if you can manage it.
Less carbs = lower blood sugar = less insulin = improved insulin sensitivity = lower fasting numbers.
