S.H.
I found my 3-year-old up and "partying" at 2am watching a video, playing dress up and eating cereal once. Every light in the house was on! This actually happened a few times, but not quite to that extent. I think the advice you got about cutting out the nap is good. If things don't work for you, I wanted to recommend The Sleep Lady. (aka Kim West) She has fabulous idea and works as a consultant www.Sleeplady.com.