Latest / The Burnout Podcast with Fexingo: Workplace Exhaustion, Recovery, and Sustainable Careers / Why Your Brain Needs Microbreaks Every 90 Minutes
Transcript
- Lucas: There's a number that I think about a lot when I'm planning my workday: ninety minutes. That's roughly the length of one ultradian rhythm — a biological cycle our brains follow throughout the day. Luna: Ninety minutes — that's about the length of a movie without the credits, or a really good meeting if you're lucky. Lucas: Right. And the research shows that after about ninety minutes of focused cognitive work, our brain's ability to sustain attention drops off a cliff. Not gradually — a cliff. A study from the University of Illinois last year tracked knowledge workers across two weeks. They found that people who took a five-minute microbreak every ninety minutes reported twenty-eight percent higher energy levels at the end of the day and nineteen percent lower emotional exhaustion. Luna: That's a huge effect for just five minutes. What did they actually do during those breaks? Lucas: That's the key. The people in the study who got the biggest benefits did one specific thing: they physically moved away from their screens and did something that didn't require decision-making. Stood up, walked to the kitchen, looked out a window, stretched. The ones who stayed at their desk and scrolled social media? Their energy didn't recover. The break has to be a genuine cognitive disengagement. Luna: So checking your phone doesn't count. That's a hard one for me — I always think I'm 'resting' when I switch to Instagram for two minutes. Lucas: Yeah, but your brain is still processing visual information, making micro-decisions about what to scroll past, and triggering dopamine responses. It's not a break — it's a different kind of work. The ultradian rhythm is tied to our basic biology, like sleep cycles. We have natural peaks and troughs of alertness. The problem is that modern open-office culture and hustle mythology tell us we should grind through those troughs. Luna: I remember reading about a study at the Draugiem Group — they used a time-tracking app and found that the most productive employees worked in focused sprints of about fifty-two minutes, then took seventeen-minute breaks. Not five minutes, but still — the pattern is clear. Lucas: Exactly. And the seventeen-minute break included walking, reading, or even napping. The point is that the highest performers don't work continuously. They work in pulses. The ninety-minute figure comes from sleep researcher Nathaniel Kleitman, who discovered that our brains cycle between REM and non rem sleep in ninety-minute periods. He later found the same cycle applies during waking hours — what he called the 'basic rest-activity cycle.' Luna: So we're biologically programmed to need a break every ninety minutes, and we've designed workplaces that punish that natural rhythm. Meetings scheduled back to back, no permission to step away. Lucas: Right. And the cost is real burnout. The Illinois study measured emotional exhaustion using a validated scale, and the microbreak group scored significantly lower. That's not just feeling better in the moment — it's a buffer against long-term depletion. Luna: I wonder if the resistance to breaks is partly cultural. There's this idea that if you're not visibly busy, you're not working hard enough. I've definitely felt guilty stepping away from my desk for five minutes. Lucas: Totally. There's a concept called 'presenteeism' — being at your desk but checked out. That's worse than taking a real break. The microbreak is actually an investment in performance. You come back with better focus, which means you get more done in less time. The data from that Illinois study also showed that the microbreak group completed tasks faster than the no-break group, even though they worked fewer total minutes. Luna: So it's not just about feeling better — it's about doing better work. That's a message I think a lot of managers need to hear. If you enforce constant work, you're likely getting worse output. Lucas: Absolutely. And there's a simple way to implement it. I use a timer — forty-five minutes of focused work, then a five-minute break. I reset that twice to get to ninety minutes, then I take a longer break — fifteen minutes. That pattern gives me four deep work sessions a day without hitting exhaustion. Luna: Forty-five and five — that's manageable. What do you do during the five minutes? Lucas: I stand up, walk to my window, look at the trees for a few minutes. No phone. Sometimes I do a few stretches. The key is that it's a complete break from cognitive effort. If I'm in the middle of a tough problem, I'll jot down a note of where I am, then step away. When I come back, I often see the solution immediately. Luna: That's the incubation effect — stepping away lets your subconscious work on the problem. There's so much neuroscience backing this up. Lucas: Right. And yet most of us ignore it because we've been conditioned to think that more hours equals more output. But the research is really clear: sustainable productivity comes from working with your biology, not against it. Luna: Let's talk about what happens when you don't take those breaks. I've had days where I pushed through for four or five hours straight, and by the afternoon I couldn't string a sentence together. Lucas: That's your brain's adenosine building up. It's a neurotransmitter that makes you feel sleepy. Normally, sleep clears it out. But during the day, microbreaks help reduce the accumulation. Without them, you hit a cognitive wall. That wall is basically your brain saying, 'I need a break, and I'm going to force one by making it impossible to focus.' Luna: So the microbreak isn't optional — it's a biological necessity. We just treat it like it's a luxury. Lucas: Exactly. And I think that's one reason burnout is so widespread. We've pathologized a normal biological need. The Illinois study is part of a growing body of work that says: take the break, do better work, avoid the crash. Luna: I want to try this tomorrow. I'm going to set a timer for forty-five minutes and force myself to take a real five-minute break. No phone, no screen. Lucas: Good. And if you find yourself resisting, just remember: the research says you'll get more done in less time. That's a win-win. Luna: Before we wrap, I want to mention something — if this episode was useful to you, and you'd like to see more content like it without ads, listener support is what makes that possible. You can find us at buy me a coffee dot com slash fexingo. Lucas: Yeah, that direct support keeps us independent and focused on the science, not the sponsors. And it really does make a difference. So thank you to anyone who's contributed. Luna: Alright, back to the rhythm. So Lucas, you mentioned forty-five minute blocks — do you ever adjust that based on the type of work? Lucas: I do. If I'm doing creative work — writing or strategy — I find I can go longer, maybe sixty to seventy-five minutes, because I'm in flow. But for analytical tasks like data review or email, forty-five minutes is my max before I start making errors. The key is to listen to your own cues. If you're rereading the same line three times, that's your signal. Luna: That's a good rule of thumb. I think a lot of people don't recognize those signals because they're so used to pushing through. Lucas: Right. And the cost of ignoring them is cumulative. One day of pushing through might not hurt, but do it for months and you're on the burnout trajectory. Microbreaks are a form of daily maintenance. They prevent the big breakdown. Luna: So to sum up: work in ninety-minute cycles, take a five-minute real break — no screens — and you'll have more energy, less exhaustion, and better output. Lucas: That's the takeaway. And remember, it's not about being lazy — it's about being smart with your most limited resource: your attention.