This paper explains the UK HSE regulatory position with regard to shiftwork and the need for shiftwork to become part of the risk management process. Advances in research understanding are reviewed and the growing evidence for the adjustment of offshore workers to continuous night shifts is discussed. Data is presented to demonstrate the significant effects of shiftwork and fatigue on accident rate. The problem of preferred vs. safest shift patterns is discussed and suggestions made as to how this problem may be addressed.

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