Nightshift work is unpleasant, and typically attracts higher rates of pay in compensation. The negative health impacts of night shift work This is a major advance, as it offers a rational target for intervention to protect the health of nightshift workers. This is misalignment of the biological clock in the worker with the external light-dark environment. Importantly, we now understand why shiftwork carries the risk. New information identifies that night shiftwork carries a clear, and significant risk to mental and physical health, even after other factors such as smoking, have been taken into account. In addition, there is an increase in the risk of metabolic diseases including obesity, and diabetes, malignant diseases, including breast and prostate cancers, and inflammatory diseases, including asthma. Nightshift work increases the risk of mental health issues, including mood disorder, and sleep disorder. Shiftwork is associated with other health risks, including smoking, and lower socioeconomic status. There are many reasons why people work nights, including increased pay rates, lack of choice, or family responsibilities. There have been concerns about the impacts of night shift work in mental and physical health, but until recently a causal link was elusive. Many people now work night shifts – in developed countries it is one in five. The implications of this new evidence for employers, policymakers, and workers, makes a wider conversation about managing and mitigating the impacts of night shift work essential.Recent research has revealed a wider number of health conditions that are related to night shift work, including a number of cancers.There is a growing body of evidence for the adverse mental and physical health impacts of night shift working.Here, Professor David Ray introduces this evidence and highlights how employers and policymakers should be paying increased attention to this issue. In recent years, the evidence base about these health impacts has expanded considerably. Night shift work has been a common feature of industrial economies for decades, and it has long been known that working through the night can negatively impact upon health.
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