4 Month old wont go to sleep before 2 am!

My son is now 4 months old. he picked up this habbit about a month ago when we moved. We tried everything we have even tried changing from the bassanet to the pack and play ( havent got him a crib yet). He use to sleep through the night from 830-9 till 730-8 the next day no night feedings. Now napa at 8 and wakes up at 11 and is up till atleast 130-2. Tried the cry it out method and that did not worl please any seggestings???