My dd has been getting up at 5:30 am for a couple weeks (I can't remember when or how this started - I asked my husband yesterday if she ever slept later than 6 am since the time changed! I guess she did for awhile!) I think last year I successfully did the "wake to sleep" method to extend her morning sleep, and I'm trying to remember exactly how to do this. I don't have that book, although I may go look for it today.
I think it's something like you wake the child 1-2 hrs before they've been waking (in my case, I'm thinking around 4 am) for 3 nights in a row, and it resets their sleep clock. Does this sound right? How much do I need to wake her? Just as a resettling, or does she need to be fully awake?