At 9am you decide the quarter's priority. At 10, you resolve a conflict between two directors. At 11, you evaluate an investment proposal. At 12, your partner asks what you want for dinner and that question feels like the last straw.
That's decision fatigue. And it's not a lack of character: it's neuroscience.
What decision fatigue is
Research in cognitive psychology shows that decision-making capacity is a limited resource. Every decision — big or small — consumes mental energy. The more decisions you make throughout the day, the worse the quality of the next ones.
For a professional in a leadership position, the daily decision volume is enormously higher than average. And most of those decisions have real consequences for other people, adding a layer of responsibility that amplifies the wear.
How it shows up
Decision fatigue doesn't always feel like tiredness. It manifests as procrastination on decisions that used to be simple, disproportionate irritability over minor issues, a tendency to "go with the flow" or delegate impulsively, difficulty separating the important from the urgent, and a growing feeling that everything is too much.
At home, it translates into an inability to be present. The body arrives; the mind stays at the office, or simply switches off.
It's not that you care less. It's that your brain has spent its entire capacity for caring during working hours.
The dimension coaching doesn't address
Executive coaching usually tackles this with productivity techniques: automating small decisions, delegating more, organising better. All useful but insufficient if underneath the decision fatigue there's something deeper: a need for control that won't let you release, a fear of error that makes you revisit every decision, a self-demand that prevents you accepting "good enough", or a pattern of excessive responsibility-taking that goes way back.
A space to put the load down
In a support process, decision fatigue is addressed on two levels: the practical (tools for nervous regulation, energy management, recovery) and the deep (which personal patterns feed the overload, which beliefs about work and self-worth prevent you from setting limits, and what you need from your environment that you're not asking for).
Sometimes, the most important decision a leader can make is to take care of their own capacity to decide.