In my 60+ years of T1D I never found a way to prevent it. On a pump I have been able to program a large increase in basal rate. I have tried low carb, difficult to maintain for many years, and no effect. I have tried not eating after dinner- no effect. In the past 2 years I have been also experiencing a high 20 min after going to bed, ranging from an increase of 50-100 mg/dl.
One thing that can affect dawn phenomena is statins; they tend to increase BG. It’s in the patient information.
Mike