Yup - DS was about 8.30; he'd be up until 11pm with no ill effects the next day if he could though! And do that every day if possible - even without day sleeps. (I didn't continue that experiment beyond 3 days, but he was a "good" child those three days too.)

Now he's at school, he's asleep before 8pm most nights, earlier if he can be. However, he does get up at 6.30-7am now. If we give him a late night on a weekend he stays in bed until about 8.30-9am, which is bliss. (Only DH won't make every Friday night Late To Bed night like I would!)