Definition
Shift work is any work schedule outside the standard daytime hours. It disrupts circadian biology in ways that produce real, measurable health effects, and it is one of the most under-treated occupational health issues.
Why it matters
Shift workers are asked to override their biology for their livelihood. Acknowledging the cost — and mitigating it — is a matter of both health and justice.
The Science
Shift work is classified as a probable human carcinogen by IARC and is associated with metabolic syndrome, cardiovascular disease, cognitive impairment, and mood disorders. Directional rotation, light exposure, and strategic napping can reduce, but not eliminate, harm.
The NSI Perspective
NSI treats shift work as a legitimate biological stressor deserving legitimate protective care.
Clinical Implications
Shift-work sleep disorder is a diagnosable, treatable condition. Occupational health approaches should include circadian science.
Practical Application
If you work shifts, you are not weak for struggling. You are a mammal doing extraordinary work.
References
- 1.Kecklund G, Axelsson J. Health consequences of shift work and insufficient sleep. BMJ. 2016;355:i5210.