Cook noodles
Cook lasagna noodles and drain.
Make filling
Mix together ricotta, spinach, 1/2 cup mozzarella, parmesan, and eggs; mix well.
Assemble
In a 15x9 lasagna pan, layer: 1 cup of sauce, half the lasagna, half the remaining sauce, all of the spinach mixture, half the remaining mozzarella, remaining lasagna, and remaining sauce.
Bake
Cover and bake in a 350° oven for 45 minutes.
Uncover and top with remaining mozzarella; bake 15 minutes more.
Let stand 10 minutes before serving.