How is it possible that she's not tired?

[emkana]

Dd2 is going to be three in August.
Last night she was messing around until half past nine, then this morning she woke up by herself at 7 am. You would think she would be knackered now, but instead she is again messing around and no matter how angry I get with her she just won't go to sleep. aaaaaaaaaaaaaaaaaargh

overtired? Or just doesn't need much sleep perhaps? I never slept much as a child either and it drove my mum insane. I can remember lying in bed at night fr hours on end listening to everyone downstairs and just being completely unable to get to sleep. I would read in secret under my covers (when i was older obviously)