India, June 13 -- The confrontation you had years ago may suddenly return in the middle of the night, keeping you awake as you ruminate over a better comeback or the many ways you could have handled it differently. Or, randomly during your commute, your brain decides to replay the embarrassing school memory where you tripped in front of your crush, mispronounced a word, or said something awkward that nobody else probably remembers.ALSO READ: Sleeping late every night? Study says poor sleep makes your brain age faster

These memories may be trivial, but they can still return with embarrassing freshness and crystal-clear detail. But why do such memories refuse to fade, and why do they randomly come up years later?

Let's understand why the ...