This is a subject executives raise obliquely, usually near the end of a session, framed as a passing observation rather than a question. They mention that they have been having a bit more wine in the evenings. They wait to see how I respond.
What I want to say here is what I say then. Most executives who drink are not in trouble, and I have no interest in pathologizing an ordinary glass of wine. But nearly every executive who drinks regularly is paying a performance cost they have never measured, for the straightforward reason that the mechanism is invisible from the inside. That is worth understanding on its own terms, quite apart from any question of whether someone has a problem.
The Cost Is Almost Entirely About Sleep
Alcohol is a sedative, and it does what sedatives do: it shortens the time it takes to fall asleep. This is the effect people notice, and it is the reason the evening drink feels like it is helping. It is also the smallest part of the story.
As alcohol is metabolized over the following hours, the picture reverses. REM sleep, which supports emotional processing and associative thinking, is suppressed in the first half of the night. The second half becomes fragmented, with more frequent brief awakenings that the sleeper does not remember. Overnight heart rate rises, heart rate variability falls, and the autonomic recovery that should be happening during the night largely does not.
The result is a night that felt fine and was not. The person wakes at the usual time, having been unconscious for the usual duration, and reports sleeping well. What they lost was not hours. It was the restorative structure inside those hours, and that structure is what the prefrontal cortex depends on.
The following day, then, brings a version of the cognitive picture I described in the piece on sleep and executive performance: reduced working memory, degraded emotional regulation, a lower threshold for irritability, and diminished capacity to hold competing considerations at once. None of this presents as a hangover. There is no headache to attribute it to. So it gets attributed to the meeting schedule, the quarter, or the difficult direct report.
The Anxiety Rebound
The second mechanism is less widely understood and, in high-functioning leaders, often more consequential.
Alcohol enhances GABA activity, the brain's principal inhibitory signaling, which produces the familiar loosening of tension. The nervous system responds to this by adjusting: it reduces inhibitory tone and increases excitatory activity to maintain balance. When the alcohol clears, usually in the early hours of the morning, that compensatory adjustment is still in place and is now unopposed.
What this produces is a period of physiological over-arousal. Waking at three in the morning with a racing heart and a mind that immediately produces a list of concerns is not a psychological event. It is a pharmacological one. Executives routinely interpret it as evidence that they are more worried about the business than they realized, when it is more accurately evidence that they had two glasses of wine at nine o'clock.
The pattern that follows is the one worth watching. The next evening arrives with an elevated baseline anxiety produced by the previous evening's drinking, and alcohol is a reliable short-term treatment for exactly that. The loop closes quietly and it can run for years without anyone crossing a line that would be visible to a colleague.
Why the Culture Makes This Hard to See
Senior leadership is structurally saturated with alcohol. Client dinners, deal closings, board dinners, industry events, the decompression drink after a difficult day. In several sectors, declining is socially costly in ways that are real rather than imagined.
This creates two distortions. The first is that the comparison group is skewed. An executive assessing their own drinking against their peers is comparing themselves to people in the same environment with the same pattern, which is uninformative. The second is that a great deal of the drinking is functionally required, which makes it easy to describe as professional obligation rather than choice, even when the pattern has extended well beyond the obligations.
The Signals That Actually Matter
Executives who worry about this almost always ask a quantitative question: how much is too much. It is the wrong question, because the meaningful signals are functional rather than volumetric. Two people can drink identical amounts with entirely different clinical pictures.
What I attend to instead:
- Whether the drink is for enjoyment or for regulation. A glass of wine with a meal you are enjoying is a different act from a drink taken specifically to bring an activated nervous system down. The second is self-treatment, and self-treatment escalates.
- Tolerance drift. If the amount that used to produce the desired effect no longer does, the nervous system has adapted. This is a physiological finding, not a moral one, and it is one of the more reliable early indicators.
- Protection of the drink. Noticing mild resistance to plans that would preclude drinking, or relief when they fall through, is meaningful. So is the drink moving earlier over time.
- Concealment. Understating consumption to a spouse or physician, even by a small margin, indicates that some part of the person has already made an assessment.
- The reluctance to look. If reading this list produced an impulse to stop reading, that is itself the finding. I mean that without judgment. It is simply the most consistent signal I encounter.
None of these establishes a disorder. All of them warrant honest attention, and several of them are considerably easier to address early than late.
What Is Worth Doing
For most executives the useful intervention is not abstinence. It is measurement, because the entire problem is that the cost is invisible.
The experiment I suggest is straightforward: two weeks without alcohol, with attention to sleep quality, morning anxiety, afternoon energy, and emotional reactivity. Most people are surprised, and the surprise is the point. The comparison is not available while the pattern is continuous, because there is no baseline to compare against. Wearable data on sleep staging and overnight heart rate variability makes this more legible and is worth using if you already have it.
Some leaders will find the two weeks unexpectedly difficult. That difficulty is information of a different order, and it deserves a proper clinical conversation rather than a resolution to try harder.
The other thing worth examining is what the alcohol is doing. When drinking is regulating an underlying anxiety disorder, a depressive process, or an untreated sleep disorder, addressing the underlying condition frequently resolves the drinking with far less effort than attacking the drinking directly. This is one of the more common findings in executive wellness coaching with senior leaders, and it is exactly the sort of distinction that requires clinical training to make.
The Reason to Take It Seriously
Executives are, in my experience, unusually receptive to this material once it is framed as performance rather than morality. They have already accepted that sleep, exercise, and cognitive load affect the quality of their judgment. Alcohol belongs in the same category, and it is arguably the largest modifiable variable most senior leaders have not examined.
The leaders who look at this honestly tend not to stop drinking. They tend to drink differently, with an accurate understanding of what it costs, on the nights when the following day can absorb it. That is a reasonable and adult position, and it is only available to someone who has actually measured. If you would like to examine the pattern with someone qualified to interpret it, you can begin here.