That newborn of yours took a while to figure out the difference between night and day -- and you expected this. But you didn't anticipate that his whole first year could leave you feeling like you got a job working the graveyard shift. If sleep deprivation has you weeping into your coffee mug, take heart: It's possible to put an end to those 2 a.m. wake-up calls. "After 4 months, a baby's natural preference is to sleep," says clinical social worker Jennifer Waldburger, coauthor of The Sleep-Easy Solution. "He just doesn't always know how to stay asleep. But even bad habits are usually fixable in just a few days." Use our advice to sort out what's keeping your baby up at night.