Hi,
what is your treatment for high blood sugar? If you are taking insulin, it could mean that your evening insulin:carb ratio means you need a higher dose of insulin in the evening.
You may also find that eating less carbs at your evening meal may be helpful in controlling your blood sugars.
Alternatively a walk after dinner may help keep things under control.
Quite a few things to try. We are all different in what works for our diabetes.
Hope this helps.