Board Thread:The Panopticon/@comment-7302713-20130331225051/@comment-6433721-20130401001216

You might as well ask why Amy doesn't remember the events before the Big Bang as a child. And why Rory doesn't remember being a Roman until after the Big Bang.

The Doctor's travels are linear for him. He mentions the need to stay relative to the Master in the causal nexus in the End of Time. When he interacts with Amy and Rory, he generally tries to hit them up in the same order, likely because of this (and we see how careful he is with River when he knows he can't with her). So he goes for two hundred years, waving at them through history... And young Amy, who is seeing psychiatrists about the Doctor, never noticed these stories? No, because young Amy is before these actions in the causal nexus, with a few choice exceptions. When things wobble a bit, he controls the information, and if necessary takes action to shore up the idea that stuff is caused by other stuff, so that people don't know enough to change other things.

Throughout his time of visiting his companions, there is an equivalent him for them. He takes care of the causal nexus, so it takes care of him. And, yeah, her waking up one morning with the memory makes as much sense as the rest of her story. Remember Night and the Doctor? Amy doesn't remember the lady with the ice cream cone cheering her up until after she focuses on the event. She changes her own past, changing her own memories, but not until other circumstances have come together to allow her to do so. Until they have, it simply hasn't happened.

Ack - sorry, don't know how to address this without speculating so - the only evidence we have is that she acts like she doesn't remember the story until the Amy concurrent with us and the Doctor had it happen.