not what time do they, but what would you think is good?
My 3yo just woke up at 0645 and started playing in his room, I was already awake and just heard him and felt quite pleased. he hasnt woken up the last few nights - which is relevant I think too.
His sisters were either asleep / reading so I have come downstairs to study while DH snores.
it feels quite civilised for once.