My daughter used to do the same thing and still does sometimes, we now have a definate bed time, she watched the story makers on cbeebies then the first half of Emerdale, if she's not tired she is aloud her night light on for a short while (while i eat my tea!) and given a book to read, she seems to like this responsibility to choose when to settle down, within half an hour every night she has put her book under her pillow and is fast asleep. she was 3 on monday I'm sure your daughter will like this idea too