So what if


She just didn't go to sleep and she stayed up all night. At what point does she forget? When she falls asleep?

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I'm guessing they tried that and got confused while awake AND tired at the same time.

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I've watched it again, the doctor says her brain is unable to convert short term memories into long term memories while she's asleep, so if she stays awake, she won't forget
I hope i've helped!

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