Our subconscious mind pretty always think of something, like daydreaming or visiting memories or just processing information in the background (the reason why out of nowhere you just know the answer someone’s asking you a while ago). When your conscious mind becomes idle, it just picks up whatever the subconscious is doing (just explaining like OP is 5, not going into details).
This always happens. Whether you are randomly think about your crush, ask yourself if you locked the door, remembered you mistaken someone as another person, etc. It just so happens you react differently when an embarrassing memory was being recalled.
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