Cook your bacon while the squash is cooking! *See notes section for how I cooked my bacon.
Scoop out roasted acorn squash flesh into large bowl. Mix in chopped sage and tomato sauce until well combined and completely smooth (aka no clumps of acorn squash).
Coat an oven-proof skillet with the remaining 2 tablespoons olive oil. Begin layering lasagna, starting with a layer of noodles, followed by a layer of acorn squash tomato sauce puree, then bacon crumbs, then another noodle layer, then a ricotta layer, and continuing until all ingredients are gone (ending on a ricotta layer – I repeated the complete layering cycle twice: noodles, acorn squash, bacon, noodles, ricotta, noodles, acorn squash, bacon {save a few crumbs for the very top of lasagna}, noodles, ricotta). Sprinkle parmesan on top of the last ricotta layer plus any bacon crumbs that are left. Cover skillet with tin foil then bake in the oven (at 400F still) for 45 minutes. Remove foil then cook an additional 5-10 minutes or until lasagna is golden.
* I cooked by bacon in the oven at 400F for 30-40 minutes. Spray a metal cooling rack with cooking spray, lay bacon slices out on the cooling rack so that none of them overlap, place cooling rack into a jelly roll pan lined with parchment paper (for easy clean up) then bake at 400F for 30-40 minutes, depending on how crispy you like your bacon cooked.