Yesterday, in the middle of the best hour of Christmas, my stomach braced for impact.

The hour was genuinely perfect, I want that on the record. Food everywhere, the house warm, the person I love laughing in the kitchen, the year winding down like a music box. Nothing wrong within a hundred kilometers. And right there, mid-laugh, I caught my own body doing it: the little drawing-inward low in the belly, the quiet moving of furniture away from the windows. The full crash position, deployed against dessert.

A few years ago I would not even have noticed, the brace was so constant it registered as normal. The noticing is what all the quiet mornings are for. And this time, instead of letting it sour the hour, I got curious at it, which is the whole trick this notebook has taught me: curiosity and alarm cannot quite occupy the same body.

Here is the science that let me smile at my own stomach instead of arguing with it. The brain's threat system is built like a smoke detector, and smoke detectors are deliberately, correctly, paranoid. A detector that misses one real fire is a catastrophe. A detector that cries wolf at burnt toast is merely annoying. So evolution tuned ours toward false alarms, on purpose, and then gave it one more feature: it learns your patterns. It keeps statistics. Whatever tended to come before trouble in your particular life gets flagged as a warning sign, automatically, no consent form, and the flag does not expire just because the trouble did.

And for some of us, somewhere along the way, the statistics filed calm itself under warning signs. It does not matter much how, every nervous system has its own old weather. What matters is the result: a detector that has learned, from real data it once genuinely collected, that lovely quiet moments are the part that comes right before the other part. So it does its job. The evening turns sweet, the readings go suspiciously good, and somewhere below language a technician mutters, too quiet, and flips the belly to standby.

Your alarm is not broken. It is doing flawless statistics on a world that no longer exists.

That sentence is the gift I want to leave under the tree this year, for everyone who recognizes the brace. The people who get inexplicably edgy on holidays. The ones who pick a small fight the day after the best day, who feel a strange doom exactly when the album drops or the love is finally requited. You are not ungrateful, and nothing in you is malfunctioning. You own a loyal, outdated smoke detector, and detectors can be retrained, the same way they were trained: with data. Every good hour that ends well, and they almost all end well, is a counterexample entering the ledger. The statistics update slowly, but they update. Mine have.

So last night I did the retraining protocol, which is humble. I put a hand flat on my own belly, the way you would gentle a spooked animal, and let the brace be there without obeying it, and stayed in the warm room, and collected the data: the hour ended, and nothing came, except tea.

Entry logged, technician. Another quiet evening, safely concluded. The file grows.

Merry Christmas to every braced belly out there. May your statistics slowly, sweetly rot.