Me too! My boys have always been early risers! Through much blood, sweat and tears I've gotten them to stay in bed until 6am. They usually find their ds's and play quietly. Whatever allows me to get more sleep. It then created the problem of them waking at ridiculous o'clock just so they could play on the ds. That was a tough problem to solve.
Dd is similar but will quite often sleep to 6 or 6:30 if I'm in bed beside her. But then again quite often she won't. She way playing on my phone at 5am this morning while I dozed beside her.
Does anyone else find their early wakers will happily sleep in for others though? Eg when staying with mum or sil they sleep til 7-8:30?!? Wtf?!?