Decision Fatigue
Why your evening choices look nothing like your morning ones
Sustained mental effort wears down decision-making over the course of a day. Deliberate choices recruit the prefrontal cortex, and recent research shows that extended cognitive work produces measurable chemical changes in that region (including a buildup of glutamate) that make further effortful thinking harder. The result is a bias toward low-effort options: defaulting, delaying, picking whatever's easy.
You see it in small ways all day. You make sharp calls in morning meetings and then can't decide what to order for lunch. You shop carefully for a big purchase in the morning and impulse-buy online at 11 PM. Same brain, same person, different point in the budget. Front-loading important decisions and pre-deciding the small ones (what to wear, what to eat) frees your peak hours for things that actually matter.
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Decision Fatigue