Sleeping Through the Night

My Liger Lang is sleeping through the night - yay!! Of course I've read that sleeping through the night means a 5-6 hour stretch which he's been doing for the past two weeks - inconsistently at first. He usually goes to sleep around 9:45 (he still fights his sleep) and then wakes up around 4am to eat, then down again, and up for the day at 7am. So he's waking up only once a night now. As for naps, well he's really a fighter of those. Yesterday he stayed up for 4 hours straight and was a wreck! I finally got him to sleep by placing him in his crib, giving him a few ounces and running the hairdryer (I keep it in his room and set it on cool). He slept for 4 hours straight - first time he ever did that for a nap.