Last year our daughter woke up tinkerbell in her store in the MK at 4:00pm ish,
She is on a timer and it happens every 5-10 minutes, the CM's told Me & DW just to wait till the lights start on the wall and lead to the lantern that tink lights up, soooo we waited with our DD and when the lights started we told her to wake up tink and she did and the lanter lit. The CM's clapped and thanked our DD.
So unless there is a "ceremony" in the morning - I think you can wake her up any time.