How Ethical Behavior Tends to Peak During Daylight Hours
Turns out it’s not the night, but the daytime, when we’re more likely to act ethically and sometimes speak more plainly. This daytime honesty even has a name in English: morning morality. Maybe you’re not more honest at night; you’ve just run out of the energy required to lie.
The other day I stumbled upon one of those internet-ready lines that sound profound enough to be printed on a mug:
“People are generally more honest when physically tired. This is why people confess things during late night conversations.”
Translation: when we’re physically worn out, we tend to be more honest—hence all the late-night confessions.
And sure, it feels true. Nighttime has that “the world is quiet, the guard is down, the truth slips out” vibe.
But since the internet has a long and proud tradition of sounding confident while being wrong, I did what any suspicious modern human does: I went digging.
And guess what I found?
Naturally… the opposite.
Are We Morning Angels And Evening Raccoons?
A trio of researchers from the business schools of Washington, Johns Hopkins, and Georgetown noticed something interesting in the research landscape. In 2013, a paper published in Psychological Science suggested that people behave more ethically earlier in the day—and it even got a wonderfully sweet label:
“morning morality.”
Then, in 2014, these researchers decided to run their own work building on that idea. The headline takeaway is pretty simple (and mildly unsettling):
As the workday progresses, the average adult’s ability to control behavior and speech gradually decreases.
And as that control declines, honesty tends to wobble too—especially closer to the end of the day.
So the night might be good for heartfelt conversations, but daytime—particularly the earlier part—may be where our “ethical settings” are set to high.
It’s Not Just Long Hours — It’s Your Body Clock
Here’s the part I find most annoyingly persuasive: the researchers link this pattern not only to long work hours, but to circadian rhythm—your internal clock.
In other words, it’s not one-size-fits-all.
If you’re a night owl, mornings might be your sketchiest hours—your brain is booting up, and your self-control may be running on fumes.
If you’re a morning person, you may stay solid early on… but get more “creative” by late afternoon when your mental battery starts flashing red.
So two people can be equally tired, equally stressed, and still follow totally different honesty patterns depending on when their system is naturally “online.”
Your Self-Control Runs ON… Glucose
Now, why would time of day affect ethical behavior in the first place?
Some earlier research points to something very unpoetic: glucose.
A 2007 study by researchers from Florida State University (published in Personality and Social Psychology Review) suggests that one of the key fuels behind self-control is, basically, sugar energy. The ability to:
focus attention,
regulate emotions,
handle stress,
resist impulses,
avoid quick-and-dirty shortcuts (including lying),
…requires mental resources. When glucose drops, impulsive behavior becomes more likely, and self-control gets weaker.
And to make it even more interconnected, a Stanford study in 2009 highlighted a direct relationship between sleep patterns and blood sugar regulation. When sleep gets weird, the body’s ability to manage sugar can get weird too—meaning your “self-control fuel gauge” may be off before the day even starts.
So What About Late-Night Confessions?
Does this mean late-night confessions are fake?
Not necessarily. Night conversations can still be intimate, emotionally loaded, and disarming. But the mechanism might not be “tiredness makes you honest” so much as:
fatigue reduces your filters.
Sometimes what spills out at 2 a.m. isn’t a pure, noble truth—it’s your brain saying:
“I don’t have the energy to keep editing myself.”
Which can look a lot like honesty. (And sometimes is.)
In Short
People aren’t permanently good or bad, ethical or unethical—sometimes we’re not even consistent across the same day.
Your “morality settings” can shift with your internal clock, your sleep, and your energy. Morning can make saints of us. Late afternoon can turn us into little loophole engineers.
So the next time someone says, “I’m only honest at night,” you can gently consider an alternate theory:
Maybe they’re not more honest.
Maybe they’re just… out of battery.
Kouchaki, M., & Smith, I. H. (2014). The Morning Morality Effect: The Influence of Time of Day on Unethical Behavior. Psychological Science.
https://journals.sagepub.com/doi/abs/10.1177/0956797613498099






