The hidden cost of the night shift and how to sleep it off
A BBC feature examines the toll that night-shift work takes on the body, exploring how repeatedly overriding the body's internal clock affects millions of shift workers, including nurses, paramedics, lorry drivers and factory staff. Scientists say the disruption is not simply a matter of tiredness but a collision with deep biological processes that occur during sleep, with growing evidence linking chronic shift work to heart attacks, strokes, cancer, mental illness and cognitive decline. Researchers are now investigating whether altering sleep patterns, rather than merely trying to sleep during the day, could reduce this harm.
The article highlights the brain's "glymphatic system", which clears waste products during sleep, and cites research by Professor Hugh Markus at the University of Cambridge, who analysed brain scans from over 40,000 people in the UK Biobank database. His team found that people with poorer waste-clearance function were significantly more likely to develop dementia later in life, suggesting disrupted sleep may have long-term neurological consequences. Scientists including Professor Russell Foster of Oxford University are also testing whether splitting sleep into two separate blocks, rather than one long daytime stretch, might better suit those working through the night.
- Night-shift work disrupts the body's internal clock and long-term health.
- Poor sleep-linked brain "cleaning" may raise dementia risk, Cambridge study finds.
- Scientists are testing split sleep patterns to help night workers recover.
Both sides, in good faith
The strongest fair case each way — we don't pick a winner.
The case for
Those calling for stronger action argue that night shift work carries well-documented health risks, from disrupted circadian rhythms to higher long-term rates of cardiovascular disease and cancer, and that employers and policymakers have a duty of care to mitigate these harms. They favour measures such as mandatory rest breaks, better-lit and quieter rest facilities, health surveillance for long-term night workers, and fair shift premiums, arguing that essential services like healthcare, transport and manufacturing should not be sustained by quietly sacrificing workers' wellbeing.
The case against
Others caution against heavy-handed regulation, arguing that night shifts are an economic necessity for hospitals, emergency services and industry, and that many workers actively choose or prefer them for higher pay, daytime flexibility around childcare, or simply personal body clocks suited to nocturnal hours. They contend that individuals and employers are best placed to manage these trade-offs through informed choice, workplace-specific arrangements and existing occupational health guidance, rather than one-size-fits-all rules that could reduce shift availability, pay flexibility or operational viability for businesses that depend on round-the-clock staffing.