Strawberry Pudding

1 quart sliced strawberries
1/2 cup sugar
1 small package strawberry JELL-O
2 small packages vanilla instant pudding
3 cups milk (to be used for pudding instead of amount on box)
1 cup sour cream
1 large (12-ounce) Cool Whip®
1 box vanilla wafers

Heat strawberries, sugar and JELL-O just enough to dissolve JELL-O, stirring constantly. Follow box directions for mixing pudding, but use 3 cups of milk. Add sour cream. Fold in three-fourths Cool Whip. In a 9 1/2-by-13-inch casserole dish, layer wafers, pudding mix, and strawberries. Repeat until all ingredients are used. Top with remaining Cool Whip.