I seem to produce wacky babies who don't need sleep, but both mine stopped napping around 18 months. I had the same problem - if they napped they were up late. It took about a week to adjust so they weren't melting down at supper time then they were fine. I think I did make their bedtime earlier while they were adjusting. Some kids have much lower sleep needs. I remember being so upset with DD1 when she dropped to one map at 8 months...I thought she HAD to have 2 because the books all said babies that age needed two. LOL. I say drop the nap for a week and if it's miserable,, implement it again but maybe shorten it.
wife of my soldier Steve, mama to my beautiful girls Rowan (11/07) and Linden (03/10)!