Decision fatigue is the deterioration in the quality of our choices after making many decisions in a row. Each choice seems to draw on a shared and depletable resource, so by late in the day we are more likely to act impulsively, defer, or simply accept whatever is put in front of us.
The evidence
One widely cited study examined parole rulings by judges over the course of a day. Prisoners who appeared early in a session, or just after a break, were far more likely to be granted parole than those heard at the end of a long stretch. As the decisions piled up, judges drifted towards the easier, safer default of saying no. The pattern is debated, but it captures the everyday sense that judgement frays under load.
Two ways it shows up
Tired deciders tend towards one of two shortcuts. They become reckless, grabbing the first tempting option, or they become avoidant, putting the choice off entirely. Both spare the effort of careful weighing, and both can be costly.
How to protect your judgement
- Make important decisions early. Schedule the choices that matter when your mind is freshest.
- Reduce trivial choices. Routines and defaults for meals or clothing save your capacity for what counts.
- Rest and refuel. Short breaks and food can restore the quality of later decisions.
The takeaway
Willpower behaves less like a fixed trait and more like a resource that depletes through use. Designing your day so that the big choices come first is one of the simplest ways to make better ones.
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