While most of the UK sleeps, more than 8.7 million people are hard at work – keeping hospitals running, restocking supermarket shelves, patrolling our streets and ensuring that the economy keeps moving forward.
This unseen army of night shift workers is indispensable to a 24-hour society, yet often overlooked. The price they pay for keeping the country financially competitive can be steep: growing evidence shows that working nights carries serious risks for both body and mind. Disrupted sleep, disturbed circadian rhythms and social disconnection are responsible for strained relationships, along with serious impacts upon key areas of health and wellbeing.
When the body clock fights back
Sleep isn’t just rest – it’s a vital biological process that fuels memory, emotional balance and physical repair. Humans are wired to sleep in the dark and wake in the light, following a 24-hour cycle known as our circadian rhythms. Night shifts force the body to operate out of sync with this internal clock. That misalignment disrupts hormones, metabolism and immune function, throwing the body’s natural systems into chaos.
Even if night workers manage a full eight hours of daytime sleep, it’s often fragmented and less restorative than sleep at night – leaving them tired and vulnerable. And the risks increase with the time spent working at night.
There is a widespread perception – particularly among managers with no experience of working at night – that if you just get through the first few weeks of night shift work, your circadian clock settles down and your body gets used to working at night. In fact, academic research shows the opposite – 97% of night shift workers never adjust to working at night.
The physical health toll
A growing body of scientific research links night shift work to a higher risk of chronic illness. The evidence paints a worrying picture.
1. Cardiovascular disease: night workers are around 37% more likely to experience a heart attack than those who work during the day. The causes are complex: disrupted sleep, higher stress, inflammatory conditions, irregular eating and reduced exercise all play a part. Working nights also raises blood pressure and cholesterol, compounding the strain on the heart. Without regular recovery, the cardiovascular system remains in a state of constant overdrive.
2. Type 2 diabetes: the metabolic impact of night work is equally concerning. Studies show that night shift employees are 44% more likely to develop type 2 diabetes. Irregular sleep disrupts insulin sensitivity and glucose metabolism, impairing the body’s ability to regulate blood sugar. Add in inconsistent meal patterns, high-fat and high-sugar meals, sugar-dense snacks and caffeine-fuelled nights, and the risk grows even higher.
3. Sleep disorders: it seems almost inevitable – those who work through the night are more prone to chronic sleep issues. Sleep and Circadian Rhythm Disruption (SCRD) – marked by insomnia, fatigue and excessive daytime sleepiness – affects millions. Beyond making work more dangerous, poor sleep increases the risk of anxiety, depression and burnout.
The mental and social cost
The psychological strain of night work can be just as damaging as the physical effects. Sleep deprivation is a major trigger for mood disorders, and many night shift workers report irritability, low mood, memory lapses and difficulty concentrating.
The social impact is another hidden cost: night workers often miss family dinners, social gatherings and community activities. Over time, along with social isolation takes a toll. One study found that people who regularly work nights are up to six times more likely to divorce – a stark reminder of the human cost of working against the clock.
Reducing the risks
The challenges of night work are real, but the impact can be reduced. Employers and individuals can take practical steps to protect wellbeing.
For employers: predictable scheduling, adequate rest between shifts, regular health-checks, and access to wellbeing support make a measurable difference. Initiatives like Night Club are helping organisations put health and recovery on the agenda.
For individuals:
- Prioritise sleep. When you can sleep, make your bedroom as dark, cool and quiet as possible – use blackout blinds, earplugs or white noise.
- Create a predictable bedtime routine following the night shift. Try and sleep as soon as you can when you return home. You may also want to take nap an hour or so before starting the night shift.
- Eat well. Focus on whole foods, lean proteins and slow-release carbs; avoid caffeine and heavy meals before you try and sleep.
- Stay active. Exercise supports better sleep and lowers stress, and can be a powerful countermeasure to the effects of night shift working
- Take extra care driving home after the night shift. This is a dangerous time as “microsleeps” are common.
- Ask for help. Seek medical or psychological support if sleep or mood problems persist.
A collective responsibility
The effects of night work on health are not just personal – they’re societal. Sleep deprivation costs the UK economy a staggering £52bn per year in lost productivity, worker attrition and accidents; £20bn of this comes from night workers. Recognising night workers as a vulnerable group is a crucial first step in shaping fairer policies and healthier workplaces.
Our 24-hour world depends on those who keep it running after dark. Ensuring their wellbeing isn’t just an act of gratitude – it’s an investment in the health, safety and sustainability of our round-the-clock society.
About the authors:
Professor Russell Foster is a Professor of Circadian Neuroscience, Director of the Sir Jules Thorn Sleep and Circadian Neuroscience Institute (SCNi), and Head of the Nuffield Laboratory of Ophthalmology at the University of Oxford. A Fellow of the Royal Society and recipient of a CBE for services to science, his pioneering research explores how light and the body clock influence sleep and health. Since 2018, he has collaborated on the award-winning Night Club programme, with the SCNi providing the scientific foundation and evidence base that underpin its curriculum.
Night Club is an award-winning initiative designed to help businesses reduce the risks of night work and support shift workers in improving their sleep, health, engagement and performance. From live, in-person training experiences delivered at night, to management and leadership support that embeds a culture of wellbeing within organisations – Night Club’s unique interactive approach delivers proven results.
Trusted by over 40 major organisations, including Transport for London, Sysco, Carlsberg Britvic and ISS – Night Club has already helped 14,000+ night workers stay healthy, safe, and engaged.
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