You do whatever it takes. Have you figured out how to position her in the Baby Bjorn while you stretch out in the recliner? Andy can actually sleep in the recliner with a baby on his chest; he's done it with all three, and now that they have a double rocker/recliner, he's done it with all three at the same time. Sarah, for some reason, still isn't always down all night, and many mornings Sonja finds Andy asleep on the couch with Sarah curled up on top of him. If he hears her first, he knows that it's easier for him to get back to sleep than it is for Sonja.
Masaki, I admire you so much for going through this side-by-side with Amanda. I know she's told you how much it means to her.