Sleep Better, Work Better: An Underrated Advantage of The 4-Day Work Week

There's always some bloke in the office that brags about living in a sleep deficit. Always a "Yeah, I only sleep 5 hours a night. I just don't need sleep." It's usually the same bloke who wears shorts when it's -4 degrees and claims he's not cold. And if you live like that, more power to ya! But the majority of people need 8-10 hours sleep per night and maybe a portable hand-warmer.

Modern work has normalised chronic sleep deprivation to the point where bragging about surviving on 5 hours of sleep is treated like an Olympic event rather than a public health concern. But what if the problem isn't your sleep hygiene, your bedtime routine, or the fact you scrolled TikTok until midnight? What if it's your working week?

Enter the four-day work week (4DWW). While much of the conversation has centred on productivity and work-life balance, one of its most overlooked benefits is also one of its most important: better sleep.

And that's not just because you get an extra lie-in on Friday.

The Sleep Deficit We're All Pretending Isn't There

Let's face it: the traditional five-day work week isn't exactly designed with human biology in mind. Millions of adults consistently fall short of the suggested 8-10 hours of sleep per night. Long working hours, lengthy commutes, endless meetings that could have been emails, and the delightful habit of checking Slack at 10 p.m. all chip away at our sleep.

The result? A nation fuelled by caffeine, cortisol and blind optimism.

Poor sleep doesn't just leave you grumpy. It impairs concentration, decision-making, memory, creativity and emotional regulation. In other words, it makes you objectively worse at the very job you're staying awake to do.

It's almost as though exhausted people aren't at their best (revolutionary stuff I know).

Recovery

Evidence from four-day work week trials consistently shows that employees report better sleep and fewer sleep problems when working reduced hours.

The landmark UK four-day work week pilot, involving nearly 3,000 employees across 61 organisations, found that around 40% of workers experienced fewer sleep difficulties or insomnia symptoms after moving to a four-day schedule (100:80:100 model).

That's not because everyone spent Fridays unconscious until lunchtime (although that's usually how I spend my Saturdays). Instead, the extra day created something increasingly rare in modern life: time. Time to recover. Time to rest. Time to stop feeling like every waking moment has been allocated in a colour-coded calendar.

What a way to live!

Recovery Isn't Laziness

There's an odd cultural belief that rest must somehow be earned. We admire people who "push through", celebrate hustle culture, and quietly judge anyone spotted relaxing before they've answered every email ever written (I put this down to too many 'hustler' podcasts). Science, however, remains stubbornly unimpressed by this attitude.

Recovery isn't a luxury—it's maintenance. A three-day weekend provides more uninterrupted recovery time than the traditional two-day scramble of laundry, shopping, cleaning and wondering where Sunday disappeared to. With an additional day off, people have more opportunity to catch up on sleep, exercise, see friends, attend appointments and generally exist as functioning humans rather than workplace accessories.

Within this perspective, it's no wonder why everyone is more productive the following week.

Stress Is the Enemy of Sleep

If you've ever lain awake replaying tomorrow's meeting in your head or mentally rewriting an email you sent three hours ago, congratulations: you've met work-related rumination.

Stress keeps our brains alert long after the laptop has closed. Elevated stress hormones make it harder to fall asleep, harder to stay asleep, and easier to wake up at 3 a.m. wondering whether that spreadsheet really needed another pivot table.

Reducing working hours appears to reduce this cycle. People working four-day weeks consistently report lower stress, less burnout and reduced emotional exhaustion.

No more spreadsheet nightmares!

Better Sleep = Better Work. Simple As.

In pretty much all my previous insights I discuss the fact that the 4DWW often leads to maintained or increased productivity due to the reimagining of daily tasks and schedules in addition to a reduction of non-productive work activity.

Useless meetings? get rid of them.

meaningless tasks? In the bin.

Getting held hostage by Sharon while she rambles about why her third husband wasn't good enough for her and how she needs someone who can be stable and spontaneous while also making her feel like she doesn't have to ask to be made to feel like the only woman on earth but not too much of the time because the right person for her will also have a funny side where they can joke around but not too much of a funny side otherwise she won't be able to take them seriously when they are trying to be romantic? avoided at all costs.

But we don't often discuss how critical sleep is and the proverbial fruit a good nights' rest can bare.

Because well-rested people think more clearly, solve problems faster, make fewer mistakes and generally require fewer emergency KitKats to get through the afternoon. Sleep improves attention, memory, creativity and decision-making. It also reduces workplace accidents, absenteeism and presenteeism—that curious phenomenon where someone is physically at work but mentally somewhere between their third coffee and a beach in Greece.

The evidence suggests that an alert employee working four focused days often contributes more than an exhausted employee dragging themselves through five.

Not All Four-Day Weeks Are Created Equal

There is one very important caveat to mention here; a genuine four-day work week means working fewer hours, not squeezing five days of work into four marathon shifts.

Working four ten-hour days may simply replace one problem with another. Longer days can increase fatigue, delay bedtimes and leave less time to unwind before sleep. The evidence for improved sleep is strongest when working hours are genuinely reduced while pay is maintained.

"Same chaos, fewer days" isn't quite the dream we're aiming for.

Sleep Is a Productivity Strategy

Perhaps the biggest lesson from four-day work week research (and work wellbeing in general) is that sleep isn't the enemy of productivity—it's one of its greatest allies. For decades we've treated sleep as negotiable. Stay up later. Wake up earlier. Push harder. Yet the research tells a different story.

People who sleep better tend to be healthier, happier, more creative, less stressed and more productive. Maybe the future of work isn't about squeezing more hours out of people. Maybe it's about finally letting them get a decent night's sleep.

After all, your mattress has been quietly supporting your career for years. It might finally deserve some credit.

ALL HAIL THE MATTRESS OVERLORDS!

References

• Campbell, T. T. (2024). The four-day work week: A chronological, systematic review of the academic literature. Management Review Quarterly, 74(3), 1791–1807. https://doi.org/10.1007/s11301-023-00347-3

• Campbell, T. T., et al. (2025). Could the 4-day week work? A scoping review. Asia Pacific Journal of Human Resources. https://doi.org/10.1111/1744-7941.12395

• Ferreira de Araujo, I., & Venz, L. (2025). The four-day workweek: A systematic literature review on sustainability trade-offs within and between compressed and reduced-hour models. Sleep Science, 18(Suppl. 2). https://doi.org/10.1055/s-0045-1812691

• Schor, J., Fan, W., Kelly, O., Gu, G., et al. (2025). Work time reduction via a 4-day workweek improves workers' well-being. (International multi-country trial).

• Takahashi, M. (2012). Prioritizing sleep for healthy work schedules. Journal of Physiological Anthropology, 31, 6. https://doi.org/10.1186/1880-6805-31-6

• European Commission. (2023). Does the science back a 4-day workweek? https://cordis.europa.eu/article/id/443330-does-the-science-back-a-4-day-workweek

• 4 Day Week Global, Boston College, University of Cambridge, & Autonomy. (2023). The UK four-day week pilot: Results report.