Forgetting memory

It's actually happen long time ago. Not really bothering me just curious.

My friend come to my room and borrow my book. Because I need the book also so I ask her to return it. She promise to return it at night. But at the nigth I feel so tired and fall asleep. When I wake up it's already morning and I remember the book still with her and she didnt come last night.

But I'm surprised to find that the book is already on my desk, next to my bed!

When I ask her, she says she did come last night and returned that book directly to me.

But I never remember that happen. Until now I never remember, even a second flashback of it.

Do you guys ever experienced things like that? was it sleepwalking? Or it's some kind of amnesia? I Love to hear your opinion about it.

[Papa Bear]

Hi ryeu, and welcome, your question raises an interesting observation, when we misplace a thing, because we forget where it is, when we find it, after a process of elimination, or as a seemingly intuitive moment, we forget that we knew all the time where it was, because we put it there. Memory creates a link between times for us, but when that link is seemingly broken, our awareness in the moment does not recognize the memory, so it declares a discovery, when in reality, it is a subliminal memory, out of reach of our conscious recognition. If you were given the book back, moments before you fell asleep, then you could easily forget those moments.

Hi Papa Bear, thank you for responding. What make moments before we fall asleep could easily be forgotten? Because it doesnt happen everytime.