Hi, TB! My daughter is just the same. . . 16 months old. She goes to bed at 7:30 and is up at 5:30. A 1.5 hour nap around 11am, sometimes only 1 hour. Remember when we hear the AVERAGE sleep for a toddler is 13-14 hours in a 24 hour period, that means some kids get more and SOME GET LESS! That is why it is an average.
I have come to terms with the fact that my daughter (and son,now 4.5 same thing, never a big sleeper!!) just need less sleep. They are happy, alert, and not grumpy, and definitely sleep less than the average. Oh, well.
I was the advisor for Gifted kids at my former job. One sign of giftedness at an early age, is the child needs less sleep than their peers. So, on the up side, maybe that is why your child is not sleeping a lot. He is gifted! Yay!
H.