Add 1/2 stick of butter, brown sugar, and cinnamon to hot mashed sweet potatoes; mix well.
Grease a 9-x-13-inch baking dish. Preheat oven to 350ยบ. Unroll crescent dough and separate into triangles. Spoon a teaspoon of mixture into each roll. Roll up crescents and place into dish.
In a pan, add 11/2 sticks butter, water, and sugar and bring to a boil. Pour over crescent rolls and sprinkle with a little cinnamon. Bake about 25 minutes or until brown.