I'm so sorry that this is so frustrating for you. Are you still putting him to bed at 8:30? Does he wake before 2 am? If he's sleeping straight through, you may have arrived at what he needs to sleep through the night. How many naps does he take throughout the day? How long do they last? You may be at the point where you need to keep him up later to fit your schedule or you need to go to bed earlier to fit his.