Eli5: Why do we forget dull activities like driving?

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It just seems like you forget very easily things like this, like you brain deletes the hours you just spent driving somewhere the moment you step down

In: Biology

Because if your brain saved everything you experienced, it would have to sort through all of that when trying to remember something important. Your brain would be over encumbered with useless information and would operate much less efficiency.

Because your brain tries to preserve pertinent information, and discard anything that isn’t useful and would take brainpower to retain.