This Friday, 13th March, is World Sleep Day. An annual event organised by the World Sleep Society to shine a light on the critical role sleep plays in our physical and mental health. This year's theme, Sleep Well, Live Better, feels particularly timely.
Because most of us know we're not sleeping enough. We just don't always connect the dots between a few bad nights and the tired, irritable, slightly-less-sharp version of ourselves that turns up to work on Monday morning.
And as an employer or manager, those dots are very much your business.
The scale of the problem
The figures are hard to ignore. RAND Europe estimates that poor sleep costs the UK economy up to £40 billion a year in lost productivity, and more than 200,000 working days are lost annually as a direct result of sleep deprivation among the UK workforce.
A survey by sleep specialists Land of Beds found that 56% of UK employees say tiredness is affecting their ability to concentrate and perform at work. Nearly six in ten admit to making poorer decisions when sleep-deprived, and more than one in four have taken time off because of fatigue. Meanwhile, Zurich Insurance data shows that only 36% of UK employees report regularly getting good sleep. That means roughly two-thirds of your team could be turning up already running on empty.
These aren't niche statistics. This is the reality of most workplaces, right now.
What sleep deprivation actually does to people
It's easy to dismiss poor sleep as a personal lifestyle issue — something for individuals to sort out themselves. But the science tells a more complicated story.
When someone is consistently sleep-deprived, their cognitive performance deteriorates in ways that directly affect their work. Reaction times slow. Decision-making becomes impaired. And research has shown the effects can be comparable to alcohol intoxication. The ability to regulate emotions also takes a hit, which means tired team members are more likely to feel overwhelmed, more reactive under pressure, and less able to support the people around them.
The mental health connection matters too. The Sleep Foundation and Harvard researchers have found that insomnia increases the risk of depression by up to fivefold. And around 80–90% of people experiencing clinical depression also have sleep difficulties. Sleep and mental health don't just overlap; they feed into each other in ways that, if left unaddressed, can spiral quickly.
This isn't just about early nights
But the World Sleep Day message isn't "go to bed earlier." It's a much wider conversation about the conditions we create for ourselves and for the people who work for us.
37% of UK adults believe that work is negatively affecting their sleep. Stress, long hours, high workloads, blurred boundaries between work and home life — these are all factors that sit very much within an employer's sphere of influence. When an employee lies awake at 2am worrying about a deadline, that's not just a personal problem. It's often a signal of how the workplace is functioning and of the culture being created.
The good news is that this means employers can make a real difference, not by policing bedtimes, but by taking wellbeing seriously in the ways that actually count.
What employers can do
None of this requires grand gestures or expensive initiatives. Small shifts in culture and management approach can have a meaningful impact on how rested and supported people feel.
Normalising conversations about wellbeing — including sleep — is a good starting point. When people feel safe to say they're struggling, rather than pressing on in silence, problems can be caught earlier. Manager training plays a huge role here. A manager who knows how to spot the signs of fatigue and how to have a supportive conversation can genuinely change outcomes for their team.
Workload management matters too. Consistently unrealistic expectations don't just affect performance; they follow people home and into their bedrooms. Reviewing working patterns, encouraging proper breaks, and respecting people's time outside work hours are all practical steps that contribute to better rest and better mental health.
Flexible working, where it's possible, can also help people manage their energy more effectively. Whether that's adjusting start times to suit natural rhythms, or having space to recover after a period of intensive work.
The point is not just to build a sleep programme, but to highlight that a culture of sustainable working depends on people being able to rest. This ability to rest directly affects productivity, morale, and mental health.
A wellbeing investment that pays off
The theme Sleep Well, Live Better is a reminder that sleep isn't a luxury or an afterthought. It's a pillar of health that’s as important as nutrition and exercise, and one in which the workplace plays a significant role, either protecting or eroding.
As an employer or manager, you won't be able to guarantee anyone a perfect night's sleep. But you can create conditions where people are less likely to be kept awake by work stress, and more likely to feel genuinely supported when they're struggling.
That's not just good ethics. It's good business.
Ready to build a healthier, more resilient team?
At Mental Health in Business, we help employers create workplaces where people's wellbeing is genuinely supported — not just in policy documents, but in day-to-day culture and management practice. From mental health awareness training to practical support for managers, our sessions are evidence-based, engaging, and designed with real business challenges in mind.
Visit mhib.co.uk to discover tailored support for your organisation, or email us at info@mhib.co.uk to book your free consultation and take a proactive step toward a healthier, more resilient team.
Because a team that feels supported doesn't just perform better — it stays.
