My daughter has been an excellent sleeper up until 3 nights ago. She previously had the odd occasion of waking up early but was generally asleep between 7-8pm and would wake up from 7-8am. Now she's decided 4:30 is her wake up time and absolutely will not go back to sleep even though she can hardly keep her eyes open. She's been "teething" (biting her dummy and hands plus dribbling a lot) for a month or two but nothing is through. Any ideas if this is a wonder week or something? Teething? Or maybe karma is catching me for having such a good sleeper so early??