Routine is so important. For my girls, I always made night time fun but structured so they knew what to expect. Basically, dinner time, play time, bath time (get into night clothes), snack time, brush teeth and go potty time, into bed and read a book time. I'd then give them a kiss and tell them I would come back in 15 minutes to check on them. (They'd have to stay in their beds, lights on, reading a book was ok). I'd check and most times, everyone was knocked out. If not, another kiss and I would come back to check on them in another 15. Once you get your son used to a routine, he'll be fine. Might be rough at first~he'll scream and cry but eventually, if you stand strong, he'll be just fine. Good luck!