An employer of night-shift workers owes a duty to warn employees of the risks of driving home in pre-dawn hours, including the effects of the circadian cycle, accumulated sleep debt, and masking of fatigue by workplace stimuli, but does not owe a duty to restructure shift times to avoid pre-dawn driving. However, a plaintiff claiming injury from falling asleep while driving must establish on the balance of probabilities that they actually fell asleep, and the absence of any subjective symptoms of fatigue or sleepiness is a powerful indicator against such a finding. The evidentiary onus principles from Bennett v Minister of Community Welfare do not reverse the legal onus of proving causation, which remains on the plaintiff.
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