DD (22 months) had been waking most mornings at 7:30/8:15 (yes I know I was lucky!).
All of a sudden she has decided to wake at 6 most mornings, sometimes even as early as 5!
In the very early days when she woke early we had a "rule" that anything before 6 we class as the middle of the night and anything after is an "acceptable" time to get up.
It's a real shock to the system but I of course accept she's ever changing and this is just yet another one.
The thing is though is that when she wakes each morning she wakes with a real cry, a loud scream/cry. It makes you jump out of bed cause you think something awful' happened.
Surely she can't be having nightmares at the exact same time each morning????