Night time is for sleeping. You are doing so well, putting yourself to sleep in the evening. We are so proud of you... However, what's with the 2AM, 3AM, 4AM crying sessions? That is sleepy time. Here is a good rule to live by, one I practiced religiously all the way through college. If there is single digits on the clock, followed by an "AM"; it's sleepy time. When 10AM rolls around, see, there are two digits on the clock now, go ahead and wake up!
Mommy's tired, Daddy's tired.. Even your big bro jailbroke out of your room last night in search of peace and quiet. Please baby... remember; "Single digits = sleepy time"