Preheat oven to 375
Cook the Italian Sausage. Meanwhile, in a large bowl combine ricotta, 3.5 cups mozzarella, parmesan, and eggs.
In a 13x9 in baking dish, spread a ladles worth of sauce. Next layer the noodles, half the cheese mixture, half the meat, and more sauce. Repeat another layer.
Cover the final layer with the leftover noodles and sauce. Sprinkle the remaining mozzarella cheese and cover with foil (Spray the foil with PAM if you don't want it to stick to the cheese.)
Bake the lasagna for 30 minutes, then remove the foil and bake for another 10 minutes.
Let the lasagna set and cool for at least 10 minutes before serving.