It is four in the afternoon. You have approved budgets, settled a staffing question, answered forty messages and sat through three meetings that each ended with someone asking what you think. Now a small question lands, and it feels strangely heavy. You notice yourself saying “whatever you think is best,” or simply “no,” just to make it go away.
Many leaders know this feeling well. It even has a popular name: decision fatigue. Before becoming a therapist, Molly spent years in banking, running a business, consulting and teaching organizational leadership, and she has a businessperson’s respect for how much rides on the quality of a leader’s judgment late in the day.
The idea behind decision fatigue is more complicated than the headlines suggest, and some of the best known research has not held up the way people once thought. This article looks honestly at what is known, and offers practical ways to protect your judgment regardless of the exact mechanism.
What people mean by decision fatigue
Decision fatigue describes a pattern: after a long stretch of making choices, people tend to make them differently. They may put decisions off, go with the default, choose whatever is easiest to defend, or swing the other way and decide impulsively. In leadership, it often shows up as saying no to anything new, approving things without real review, or snapping at a reasonable question.
Most people recognize this pattern from their own lives. The more interesting question is why it happens, and that is where the science gets more nuanced.
What the research does and does not show
The famous parole study
In 2011, researchers analyzed 1,112 parole decisions made by judges in Israel. At the start of each session, about 65 percent of rulings were favorable. That rate fell to nearly zero by the end of a session, then jumped back to about 65 percent after a food break. The study became one of the most quoted examples of decision fatigue in the world.
Later the same year, other researchers pointed out important problems. The order of cases was not random. Prisoners without lawyers often came at the end of sessions and succeeded less often, and attorneys with several cases tended to present their strongest ones first. Those factors could explain much of the pattern without any fatigue at all. The study is still worth knowing, mostly as a reminder to read striking findings carefully.
The willpower tank
Decision fatigue is often explained by a theory called ego depletion: the idea that self control draws on a limited supply of mental energy that runs down as you use it. For years, many small studies seemed to support this.
When researchers tested it more rigorously, the picture changed. In a large preregistered study published in 2021, 36 laboratories tested the effect with 3,531 participants. The planned analyses did not find evidence for a depletion effect; the researchers concluded that if the effect exists, it is likely small, possibly zero. The simple image of a willpower tank that empties by afternoon is not well supported.
Real world patterns
Some real world findings still point in a similar direction. A 2014 study of primary care visits found that clinicians were more likely to prescribe antibiotics for acute respiratory infections as their clinic sessions went on, with higher rates in the fourth hour than in the first. The authors suggested decision fatigue as one explanation. Like most observational research, it shows a pattern, not a proven cause.
The goal is not to find more willpower. It is to build a day in which good choices require less of it.
Molly Hinke-DeWild, LISW
What is probably going on
So what can a thoughtful leader take from this? A reasonable reading is that judgment does vary across the day, though probably not because of a single fuel tank. Several well understood factors tend to stack up:
- Mental fatigue. Long stretches of demanding attention make most people slower, less patient and more inclined toward shortcuts.
- Switching costs. Moving between unrelated tasks and interruptions takes effort, and a day of constant switching is tiring in its own right.
- Stress. Under sustained pressure, the brain leans more on habits and familiar defaults, which is efficient and not always wise.
- Hunger and sleep. Missed meals and short nights affect mood and attention, whatever the mechanism.
- Emotional weight. Decisions about people, money and risk carry more weight than choosing a lunch order, and leaders make many of them.
The practical upshot is encouraging. You do not need to settle the scientific debate to work with your own attention and energy wisely.
Designing a day that protects your judgment
The goal is not to find more willpower. It is to build a day in which good choices require less of it. Here are some approaches you might try.
Put your hardest calls where your attention is best
Notice when you think most clearly. For many people it is earlier in the day; for others it is mid morning after a quiet start. Protect that window for the decisions that matter most, and move routine work and email to the times when your attention is naturally lower.
Decide once, then make it a rule
Many daily decisions are really the same decision repeated. A policy turns a recurring choice into a single one. You might set clear thresholds for what you approve without review, standard formats for regular meetings, or simple personal defaults for things that do not need fresh thought each day. Each rule removes a small decision from tomorrow.
Move decisions to the right level
Leaders often carry decisions that others are well placed to make. Delegating a decision works best when you hand over the authority as well as the task, along with the criteria you would use. Your team grows, and your own judgment is saved for choices only you can make.
Write your criteria before you look at options
Before a hiring decision, a vendor choice or a budget call, write down the three or four things that matter most. Deciding what good looks like before you are tired, rushed or swayed by a persuasive presentation makes the later decision clearer and easier to explain.
Build breaks between decision blocks
Whatever the science says about depletion, breaks are cheap and people consistently find them restoring. A short walk, a real lunch away from the screen, or ten quiet minutes between back to back meetings can reset your attention more than you might expect.
Know which way you lean when tired
Under strain, some leaders default to yes and take on too much. Others default to no and shut down good ideas. Neither is a flaw; it is simply your pattern. Once you know which way you lean, you can build in a small check for the end of the day, such as asking one trusted colleague, “Would I say the same thing at nine tomorrow morning?”
Give the big late decision a night
If an important, nonurgent decision arrives late in the day, you might simply schedule it for the next morning. Saying “I want to give this my full attention tomorrow at nine” is not avoidance; it is good stewardship of your judgment.
When it is more than a long day
If every decision feels heavy from the moment you start work, if you dread choices that used to feel simple, or if you notice that your patience, sleep and sense of meaning are all wearing thin, the issue may be bigger than how your day is arranged. That pattern can be a sign of burnout, anxiety or depression, and it deserves real attention.
How IFH can help
Molly’s online coaching for high functioning professionals is designed for leaders who want to think clearly, lead well and keep their energy for the long run. It brings together her business and leadership background with a clinician’s understanding of how stress affects the mind, in a confidential space focused on your goals and your work.
If you are wondering whether you are past tired and into burnout, The High Performer Burnout Check, a free program in our client portal, is a good place to start: take the Burnout Check.
Sources
- Danziger S, Levav J, Avnaim-Pesso L. Extraneous factors in judicial decisions. PNAS, 2011.
- Weinshall-Margel K, Shapard J. Overlooked factors in the analysis of parole decisions. PNAS, 2011.
- Vohs KD, et al. A multisite preregistered paradigmatic test of the ego depletion effect. Psychological Science, 2021.
- Linder JA, et al. Time of day and the decision to prescribe antibiotics. JAMA Internal Medicine, 2014.
