cook beef until no longer pink. drain off fat; add tomatoes (squishing when you do), tomato sauce, salt, and sugar. simmer for about 10 minuets. Cook noodles according to package and drain. Blend sour cream, cream cheese, into beef mixture. Pour small amount of beef mixture into greased casserole; cover with layer of noodles and the grated cheese. Repeat layers; top with layer of cheese. Bake in 350 degree oven for 35 minuets.