I really feel you on this -- those early months with a newborn and trying to figure out the night arrangement is so tough, especially when you are heading back to work. When I was in the same situation, my husband and I took turns on weeknights, and our helper covered one stretch so we could both get a longer block of sleep. It also helped to have a simple rotation written down so everyone knew whose turn it was and there was no confusion at 3am lah. Give yourself grace as you figure out what works for your family -- it really does take a few weeks to find a rhythm that sticks.