Decision Fatigue Is Mostly Sleep Debt
Decision fatigue became a productivity staple about a decade ago, and the recommended solution was to reduce the number of decisions: identical outfits, identical breakfasts, standing meetings, defaults everywhere.
Some of that is sensible. It also treats the symptom.
What we noticed in ourselves
The days where every choice felt exhausting — what to eat, which email first, whether to say yes — were not the days with more decisions in them. They were reliably the days after a short night.
On a rested day the same volume of choices barely registers. On a tired day, choosing lunch is genuinely hard.
You don't have too many decisions. You have too few resources to make them with.
Why this happens
The capacities involved in deliberate choice — holding options in mind, weighing them, resisting the immediately appealing one — are exactly the ones most affected by short sleep.
So when you're tired, deciding costs more. And because everything costs more, you run out earlier in the day, which produces the sensation of fatigue that everyone attributes to the number of choices rather than the state you're making them in.
What tired decisions look like
They're not random. They have a shape:
- Defaulting to the status quo. Not deciding is a decision, and it's the cheapest one.
- Taking the first acceptable option rather than comparing.
- Over-weighting the immediate. Short-term relief beats long-term value more easily.
- Irritability disguised as decisiveness. Snapping to a conclusion feels like clarity.
Every one of these feels, from the inside, like normal thinking.
The unfashionable fix
Sleep, and put your decisions earlier.
Nobody's going to build a productivity system out of that, because it isn't a system. But we've found it does more than any number of removed choices, and it doesn't require owning fourteen identical jumpers.
The practical version
Anything reversible: decide whenever. Anything irreversible: only in the first half of a day that followed a decent night.
And if you can't remember the last decent night, the answer isn't to decide more carefully. It's to not decide today.
