Same here - unless I wake up DD10 at a reasonable hour, she'll happily sleep until 10 am and then not go to sleep until midnight (or later). Even waking her at around 7 or 7:30 am, in the summer she won't fall asleep until after 11 pm.

But once she's asleep, she's usually fine. If anyone has other suggestions for moving bedtimes in a more normal direction - I'd love to hear it!