Hi,
the fasting blood sugar is actually the hardest to manage in pregnancy.
You could try eating a protein / fat snack (rather than carbohydrate), at bedtime.
You could also try taking a walk after dinner (may help reduce the insulin resistance).
Ultimately though, you may end up needing medications to get your sugars on target.
Best Wishes to you and your baby.
Struggling with this too after 3 weeks of trying everything under the sun at bedtime dr put me on a pill before bed.