Combine warm water and dry yeast stir and let stand 10 minutes until frothy. Add milk, butter, salt, flour, to yeast mixture and beat until smooth and blended.
Cover and let rise at room temperature overnight. The next morning, preheat waffle iron.
Beat in the eggs and then add the baking soda. Pour the thin batter onto a well-heated and seasoned waffle iron, and bake until golden brown.