T.J.
My son is 15 months old, so maybe this is premature, but I think your son needs to go to bed at 7 or 7:30 every night - 8:30 sounds late! 19 months old seems a bit young to start skipping naps, but I have heard that it does happen. At least your son plays quietly for an hour or two - maybe that's all he needs with an earlier bedtime. (When my son refuses to nap from time to time, he cries and carries on, so be happy!) Maybe this is just a phase, too. Keep making him go down for a nap - maybe he will go back to his old routine. Good luck!
- T.