Does anyone else have a night owl?

I'm a lurker, but I could really use some advice or at least encouragement regarding LO's sleep schedule.  She'll be 5 months old next week and I'm frustrated by her late bedtimes.  For the first month or so, she would stay up until 4 AM.  By two months, she would STTN, but her bedtime was around 2 AM.  She continued to make gradual progress so her bedtime was between 12 and 1 AM, but now she seems to have stalled out, or even regressed.     

Typical day for LO: 

I usually wake her around 8:00 to nurse before I go to work.  At 9:30 she naps for about 2 hours.  She usually eats every 3 hours for a total of 6 feedings per day.  Her naps vary in the afternoon and evening, but she typically takes one in the early afternoon (45 min - 1 hr) and then two or three catnaps (20-30 minutes) spread thoughout the late afternoon and evening.  Her last feeding is at 11:00 and she goes to bed anytime between midnight and 1:30 AM.

Once we get her to sleep, she will sleep until morning (hooray!), but how can I encourage her to fall asleep earlier?  Honestly, she is wide awake and happy at night.  Has anyone had a similar experience?  We'll consider some type of sleep training at 6 months, but I don't see how training can work if she is simply not tired at night.

Thanks for reading, and thanks in advance for your help.