What happened is that countless days, nights, meetings, commutes and other unremarkable events went by, well, unremarked. They didn't make a lasting impression on the brain or they were overwritten by so many similar experiences that they are hard to retrieve. In short, they've been forgotten.
That's not necessarily a bad thing. Neuroscientists say forgetting is crucial to the efficient functioning of the mind, to learning, adapting and recalling more significant things.
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