Pour some sauce in the bottom of the pan.
Add a layer of noodles.
Spoon on some ricotta cheese and spread.
Sprinkle with mozzarella cheese.
Sprinkle on sausage.
Pour sauce over all and repeat layers until you reach the top. (I usually do about 4 layers)
Cover with foil and bake at 350 degrees for 1 hour.
Turn off oven and leave pan in the oven until cool.
Place in refrigerator overnight.
Take out of the fridge one hour before baking.
Uncover and sprinkle remaining cheese on top.
Bake in 350 degree oven for 45 minutes or until cheese is bubbly and lasagna is cooked through.