Place Warm Water In A Large Bowl (Batter Will Double It's Original Volume). Sprinkle Yeast In Water. Let Stand For 5 Minutes. Add Warm Milk, Butter Salt, Sugar And Flour. Beat Until Smooth And Blended Well. Cover Bowl With Plastic Wrap And Let Stand At Room Temperature Overnight. Just Before Cooking Waffles, Beat In Eggs. Add Baking Soda And Stir Until Well Mixed. Batter Will Be Thin. Pour Into Very Hot Waffle Iron (1/2 Cup To 3/4 Cup Batter) And Bake Until Waffle Is Golden And Crisp. Repeat With Remaining Batter. Note: Batter Will Keep In Refrigerator For Several Days.