Why does the acquisition offer that looked smart at 9 a.m. feel impossible to judge at 6 p.m.? Most CEOs have felt it: after a long day of choices, the big ones get harder, and the easy default starts to look appealing.
That experience has a name. Here’s what is decision fatigue, what the research does and doesn’t support, and a practical way to protect the decisions that matter most.
What Is Decision Fatigue?
Decision fatigue is the idea that the quality of our choices tends to decline after a long stretch of making them. People who are mentally worn down are more likely to delay, take the default option, or go with whatever requires the least effort.
The concept grew out of research on “ego depletion,” the theory that self-control draws on a limited resource that gets used up. One widely cited 2011 study in PNAS looked at 1,112 parole rulings by Israeli judges and found that favorable decisions dropped from about 65% to nearly zero over a session, then reset after a food break.
The honest caveat: the science here is contested. Other researchers argued the parole pattern could be explained by how cases were scheduled. And a large 2016 replication effort across 23 labs and more than 2,100 participants found an ego-depletion effect close to zero in the task it tested. Some researchers still find effects in other settings; others think depletion is shaped by motivation and beliefs more than by a fixed “tank.”
What’s left is a sensible, more modest takeaway. Long sequences of decisions, stress, hunger and poor sleep probably don’t help your judgment. You don’t need a contested lab result to know that a sleep-deprived CEO deciding a layoff at 7 p.m. is not at their best. For the wider picture, see the main reason entrepreneurs experience daily stress.
Be wary of viral claims that adults make “35,000 decisions a day.” We could not find a credible study behind that number.
Why CEOs Are Especially Vulnerable
Understanding how CEOs make decisions starts with how their days are built:
- Volume: Everything that can’t be solved below lands on your desk.
- Ambiguity: The decisions that reach you rarely have clean data.
- Stakes: Hiring, firing, capital and strategy have long tails.
- Isolation: Few people inside the company can give you an unfiltered view, because they report to you.
- Fragmented time: Back-to-back meetings leave little room to think.
Isolation may be the biggest factor. When there’s no one to pressure-test your thinking, fatigue and bias go unchecked. We cover this in more depth in the loneliness at the top nobody talks about.
A 5-Step High-Stakes Decision Making Framework
This decision making framework for leaders is adapted from the peer issue-processing approach used in CEO advisory groups, including Vistage boards. You can run it with a peer group, a trusted advisor or, in a pinch, on paper alone.
Step 1: Frame the real issue
Write the decision as a single question. “Should we open a second location?” is clearer than “growth stuff.” Then ask: what is the issue behind the issue? Often the real question is about a person, a fear or a cash constraint.
Step 2: Lay out the facts and what you’ve tried
Separate what you know from what you assume. List what’s at stake, the deadline, and anything you’ve already attempted.
Step 3: Invite clarifying questions
Before anyone gives advice, have them ask questions only. This is the step most leaders skip, and it’s often where the breakthrough happens. Good questions expose blind spots you didn’t know you had.
Step 4: Hear perspectives and experience
Ask others to share what they’ve seen work or fail in similar situations, rather than simply telling you what to do. Experience-based input is easier to weigh than opinions.
Step 5: Decide and commit
Choose a course of action, set a date and tell someone who will hold you to it. A decision without a follow-up date tends to drift.
Our CEO Peer Advisory Group Benefits page explains how this works inside a monthly board.
Printable Decision Worksheet
Print this and use it before your next big call.
| Question | Your answer |
|---|---|
| What exactly am I deciding? (one sentence) | |
| What is the issue behind the issue? | |
| What happens if I do nothing? | |
| What facts do I have, and what am I assuming? | |
| Who is affected, and how will they feel? | |
| What would I advise a peer in this situation? | |
| What’s the worst realistic outcome, and can I live with it? | |
| Is this decision reversible? | |
| Am I deciding while tired, hungry, angry or rushed? | |
| Who will I tell, and by when will I act? |
The “reversible” question is worth special attention. Easily reversed decisions can be made fast and delegated. Hard-to-reverse ones deserve your freshest hours and an outside view.
Considering how a decision will land emotionally also matters. For more on that, see Cognitive vs Emotional Empathy.
Daily Habits That Protect Your Judgment
Whatever the final verdict on ego depletion, these habits are low-cost and reasonable:
- Schedule big decisions early. Put high-stakes calls in the first part of your day, before your inbox takes over.
- Cut trivial choices. Standardize meetings, meals or routines where you can.
- Delegate reversible decisions. Push them to the lowest level that has the information.
- Take real breaks. Eat, walk, step away between heavy meetings.
- Sleep on irreversible decisions. If the timing allows, give yourself a night.
- Batch similar decisions. Approving expenses in one block beats doing it all day.
- Talk it through. Saying a problem out loud to someone outside the company often clarifies it.
You Don’t Have to Decide Alone
Knowing what is decision fatigue is useful. Building a system that protects your best thinking is better, and that system works best with people who’ve sat in the same chair.
If you’re carrying a decision right now that you can’t talk about inside your company, book a confidential conversation with Fenella Kim.