I too have a night-owl. 23mon DS goes to sleep at 11pm, which is so hard on me, since I still have to get up for work in the mornings.
I think part of our challenge is, DS sleeps in until he wake up around 8-9am. He does nap well, normally 2-3 hours in the afternoon.
I just started trying to get him on a set routine - slowing moving the time, the last few nights I managed to get him to sleep around 1030pm. It's progress. I hope to get him to a night bedtime of 900 or 930pm.