For new parents, sleep can seem like a rare and priceless asset. During the early months, babies can be very unpredictable in their sleeping habits, and they wake at all hours, sometimes for seemingly no reason. Many pants find that their infants settle down and sleep more predictably after the first couple of months, but then things get rough again a little later, usually between the ages of 6 and 10 months. No one is sure exactly why this happens, and research has not made it clear. However, it is likely that frequent wakeups at this age result from a variety of factors. Here are a few of the most common ones.