I wish I had some advice. I've been struggling with nights the whole time but I've reached the point now where I spent half the night wandering around the house while everyone else sleeps, having warm showers at 2am, watching bad tv, and if I'm lucky dozing off on the couch. I avoided day naps for ages because I thought they were affecting my sleep at night but I've got to the point that my little nanna naps I can squeeze in while the girls are at school/kindy are the only real sleep I'm getting. You're so close now to the end that I would just sleep when your DD sleeps so you can build up your reserves a little, and just do whatever you can around the house while she's awake.