DD10 stopped napping as soon as she turned 3. Then, she was the only kid in K4 that they ever allowed to stay up and read. She was good as gold if she didn't take a nap, but if she actually fell asleep it was never until the very end of the time and then they couldn't get her up.

DD8 continued to take naps in school through k5 but stopped at home at 3.5/4. She is the one in my house that doesnt need a lot of sleep. Stays up late and pops up early.