Ture, all babies are different and some sleep through the night later than others. It is also true that the wake up at night due to habit at this age. Her brain is mature enough to keep her asleep for 12 to 14 hours. If she has no medical problems then she has no need of food during that time. She wakes up because she has always done so.
Keep in mind that at this age, the broken sleep is starting to harm her. If she's like mine, she probably is developing multiple folds in her lower lids and dark circles under her eyes. Her behavior is probably getting worse too - a large part of the "terrible twos" is actually do to tired kids, not naughty kids. Tired kids don't learn as much during the day, they don't process what they learned while they are asleep, and they don't grow as well since growth hormones are released during sleep too.
at 11:58 AM on Oct. 27, 2008