It’s a new parents’ rite of passage: The sleepless night. After your new arrival finishes crying for the night (assuming she finishes), after you’ve fed her, had your spouse sing a lullaby, and changed the baby’s diaper, you can go back to sleep. The problem: It’s now four a.m. and you can’t get back to sleep. It’s a good bet that one of you adults has to get up in two hours and start getting ready for work as if the past two hours soothing the baby don’t count as work. Parents may want to consider these hints for grabbing a good night’s sleep while their newborn makes demands on their time and energy: