My DD (now 5) slept between 6.30pm - 7.30am and also slept 2.5 - 4 hrs per day until she was 3.5 yo. She started sleeping through the night when she was 8 weeks old and she still sleeps well through the night and rarely gets up in the night even for toilet breaks or if she is ill.
My DS is a good sleeper on the night (from 6.30 until nearly 8) and sleeps between 2 - 3.5 hrs for a nap. He is 18 months.
I get a lot of from people I know too and sometimes get told from people who are a little imo, that it does them no good. DD is a bright and energetic 5 year old and although she sleeps well through the night, she can also cope if she has a late night.