Déjà vu, earworms, and dreams about your ex: your brain's greatest reruns

About two-thirds of people report déjà vu, and the leading pop explanation — a "glitch in the Matrix" — is more fun than the likely one: your memory system briefly files a new moment as familiar, then fact-checks itself in real time. That eerie feeling is your brain catching its own typo. It's most common in your teens and twenties, when the fact-checker is apparently at its most caffeinated.

Roughly 90% of people get songs stuck in their head weekly. Earworms tend to be simple, repetitive, and rudely incomplete — your brain loops the chorus because it never got the resolution. The folk cure that research actually supports: listen to the whole song, or replace it with a "cure tune." (Chewing gum also has its defenders. Science is beautiful.)

The most awkward rerun of all. Dream lore is reassuring here: dreaming about an ex is rarely read as "you want them back." More common interpretations: your mind is processing an old chapter, or the ex is a stand-in — a symbol for a feeling from that era (being young, being chosen, being hurt) that something in your current life just poked. Log it in a dream journal and you'll usually find the trigger within a day or two. Or run it through the dream interpreter and see what theme surfaces.

Everyone has a personal syndicated lineup: the cringe compilation, the imaginary argument you keep winning, the "did I lock the door" saga. Pop psychology's favorite trick for a stuck loop is externalizing it — saying it out loud or writing it down. On paper, the 3am blockbuster is usually revealed to be a two-sentence rerun with great special effects. That's most of what a journal is for.

For one week, jot down every rerun you catch: song, dream, worry, daydream. By Sunday you'll have your brain's actual programming schedule — and spotting a rerun mid-broadcast gets easier every time. It's the same noticing muscle behind habit loops, just pointed somewhere more entertaining.