You told yourself the exhaustion was about the hours. The early calls, the late inbox, the calendar with no white space in it. But this week you sat down to make a decision you have made a hundred times before, and your mind refused. An earlier version of this article explained that moment with research. Most of that research has since been undermined, and the honest account turns out to be more useful than the confident one was.
What the Research Actually Says Now
Decision fatigue is the idea that the quality and willingness of our choices degrade as we make more of them, because deliberate deciding draws on something that runs down. It is one of the most repeated ideas in management writing. Both of its best-known supports are in trouble.
The famous illustration is a 2011 study of a parole board, published in the Proceedings of the National Academy of Sciences by Danziger, Levav and Avnaim-Pesso. Favourable rulings were high at the start of a session, declined to near zero by its end, and recovered after the judges took a food break.
That study is contested, and the objections are specific. Weinshall-Margel and Shapard argued in 2011 that case ordering is not random, making the pattern likely an artefact of how cases were presented. Glöckner showed in 2016 that lenient outcomes take longer to write and so would not be scheduled before a break. Lakens has argued the effect is impossibly large. The authors recoded their data and their results held in their own analyses, so the finding stands; what is disputed is reading it as fatigue.
The mechanism underneath is in worse shape than the illustration. The resource model of self-control, after Baumeister and colleagues in 1998, failed two large pre-registered multi-laboratory replications: Hagger and colleagues in 2016 across 23 labs and 2,141 participants, and Vohs and colleagues in 2021 across 36 labs and 3,531 participants.
A 2026 integrative review in Frontiers in Cognition by Choudhury and Saravanan is candid about this. It notes that “the resource-based ego depletion model has been subject to considerable criticism over the years” and that those studies “failed to replicate the canonical ego depletion effect”. The same review still concludes that decision fatigue “decreases the quality of decision-making but also increases the risk of stress and burnout for the decision-makers”, while naming its own main limitation: its findings are “heavily concentrated in healthcare, which may restrict the generalizability of the proposed framework to other occupational domains”.
So the honest position is this. Something real is being described, the explanation for it is unsettled, and the evidence base is mostly doctors and nurses rather than executives. Every metaphor in this article’s earlier version — the account, the reservoir, the fuel tank — was borrowing confidence from a model that has not held up. Those metaphors have been removed.
What Survives the Correction
Strip out the mechanism and something plain is left standing, because it never depended on the mechanism.
A senior role concentrates decisions. The strategic ones, yes, and underneath them the constant arrival of questions escalated upward, ambiguities that need resolving, moments where someone needs you to be certain so they can proceed. That volume is a fact about the job. It requires no claim about psychology at all.
And a day has a shape. Most people can name the hours when their thinking is reliably better, and the hours when it is not. Why that is true is the contested part. That it is true is something you can check against your own week, which is more than can be said for the research.
What follows is a reading rather than a finding. It is offered because it is recognisable, not because anyone has measured how common it is.
Four Things Leaders Describe
1. The afternoon reluctance
Sharp in the morning, noticeably duller by mid-afternoon. Not sleepy. Reluctant. Decisions start getting routed to “let me come back to you,” not for want of information but because reaching for the answer feels uphill.
2. The retreat into the trivial
Faced with a stack of choices of wildly different weight, the small concrete ones get attended to first: reordering the slide, rewording the email. They offer the relief of completion without the cost of deliberation. The consequential ones slide to tomorrow while the day still feels productive.
3. The hardening into “no”
Later in the day the defensive answer gets easier. Decline, delay, ask for one more round of analysis. From outside it can look like rigour. The cost is that good reversible bets go unmade, which is the opposite of caution when the downside of trying was small.
4. The bleed into the people around you
Patience with a struggling report, benefit of the doubt for a peer, curiosity about a dissenting view. These take effort, and they are usually the first things to thin. Tone often changes before judgment does, which is why other people register it before you do.
The Structural Problem
Most executive calendars are built as though every hour holds equal capacity for judgment. Back-to-back meetings, each demanding decisions, stacked morning to evening. The most consequential calls routinely land in the hours when people report thinking least clearly, and then the result gets taken personally.
An earlier version of this article put two figures here on how many leaders report burnout and how many have considered leaving. They came from a survey published by a firm that sells leadership development, and no source for them was ever opened and checked. They have been removed. How widespread this is, this article does not know.
What Is Worth Doing Anyway
The useful thing about the advice below is that none of it rests on the disputed research. It rests on decision volume, which is not disputed.
Triage, and be strict about it
Sort what is in front of you into three groups: the decisions only you can make and that genuinely matter, the ones you can delegate with a clear principle, and the ones you can eliminate by setting a default once. The first group is usually smaller than expected. Protect it. Give the rest away.
Sequence the important calls into your better hours
Name the two or three hours when your judgment is most reliable and defend them for consequential thinking. Status updates, approvals and reversible calls can go elsewhere, where “good enough, quickly” is the right standard. This is sequencing, not optimisation, and it costs nothing to try.
Convert recurring choices into standing rules
A choice made once and encoded as a policy is a choice you stop making. Travel under a certain amount, approved automatically. Meetings over a certain length, declined by default. Requests of a certain type, handled by a named principle rather than fresh deliberation each time.
Put real pauses between decision-heavy blocks
A walk without your phone, a lunch that is not also a meeting. Whether this restores a depleted resource is exactly what is unsettled, so the claim here is modest: people generally report deciding better after a break than before one, and the cost of finding out is fifteen minutes.
Treat sleep as an input, not a virtue
A short night shows up in the next day’s calls and in the next day’s patience. This gets moralised as discipline when it is closer to a working condition, and working conditions are something a senior person is usually in a position to change.
A Different Measure of Strength
There is an old definition of executive strength: the strong leader decides constantly, instantly, alone, and the capacity for relentless deciding is the proof of fitness for the role. The people who believe that one most are the ones it costs most.
Which leaves a smaller claim than this article originally made. Whether judgment runs on a resource that depletes is unsettled. That a senior role concentrates more decisions than a day has room for is not, and that is reason enough to be deliberate about which ones reach you.
The blankness you felt this week was not a verdict on your competence. What it was, exactly, is something the research cannot currently tell you. What you can do about it does not depend on knowing.
Why This Article Was Wrong
Decision fatigue is quotable because it is intuitive, and it stayed quotable because corrections are less interesting than the original claim. An idea that feels obviously true is the kind that gets repeated without checking. That happened here, and the correction is worth more than the original was.
Continue Reading
- Quiet Cracking: The Burnout That Still Shows Up to Work, on burnout that never announces itself.
- High-Functioning Anxiety: The Hidden Engine Behind the Executive Who Looks Fine, on competence that runs on quiet alarm.
- How to Stop Tying Your Self-Worth to Work, on what holds when judgment falters.
Further Reading
Three books, listed with their limits stated:
Thinking, Fast and Slow by Daniel Kahneman. The two-system account that popularised much of this material, including the parole-board study and the depletion research discussed above. Read it knowing which parts have since been disputed.
Why We Sleep by Matthew Walker. A widely read argument for sleep as central to judgment and mood. Parts of it have been publicly challenged, so treat it as a starting point.
The Paradox of Choice by Barry Schwartz. On what happens when options multiply. The evidence for choice overload is itself mixed, which the book predates.
Where Your Worth Is Currently Resting
If the exhaustion runs deeper than your calendar, and your sense of who you are has quietly fused to what you decide and deliver, that is worth looking at directly. The Executive Identity Profile is a confidential assessment of where your sense of worth currently rests across five dimensions, and which of them is carrying more than it should. It takes about ten minutes, and it opens a conversation rather than closing one. Begin your profile here.
If this was worth your time, there is a letter. One short piece a week on identity, self-worth and the arithmetic of senior work. It costs nothing, and leaving takes one click. See what arrives.
References
- Danziger, S., Levav, J., & Avnaim-Pesso, L. (2011). Extraneous factors in judicial decisions. Proceedings of the National Academy of Sciences, 108(17), 6889–6892. https://doi.org/10.1073/pnas.1018033108
- Weinshall-Margel, K., & Shapard, J. (2011), on case ordering.
- Glöckner, A. (2016), simulations on the hungry judge effect. https://doi.org/10.1017/s1930297500004812
- Baumeister, R. F., Bratslavsky, E., Muraven, M., & Tice, D. M. (1998). Ego depletion: Is the active self a limited resource? Journal of Personality and Social Psychology, 74(5), 1252–1265. https://doi.org/10.1037/0022-3514.74.5.1252
- Hagger, M. S., et al. (2016), multi-laboratory registered replication, 23 labs, 2,141 participants.
- Vohs, K. D., et al. (2021), multi-site replication, 36 labs, 3,531 participants.
- Choudhury, N. A., & Saravanan, P. (2026). An integrative review on unveiling the causes and effects of decision fatigue to develop a multi-domain conceptual framework. Frontiers in Cognition. https://doi.org/10.3389/fcogn.2025.1719312
This article is for general educational purposes and is not a substitute for personalised care. If burnout is affecting your health, consider speaking with a licensed therapist or another qualified professional.