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We tested the effects of a randomized controlled trial Total Worker Health intervention on workplace safety outcomes. The intervention targeted employee sleep at both the supervisor-level (eg, sleep-specific support training) and employee-level (eg, sleep tracking and individualized sleep feedback). The intervention components were developed using principles of the Total Worker Health approach and the theory of triadic influence for health behaviors. We hypothesized that employees in the treatment group would report greater safety compliance, safety participation, and safety motivation, and would be less likely to experience a work-related accident or injury following the intervention through improvements in sleep quantity and quality, as well as increased perceptions of supervisors’ support for sleep. It was theorized that the indirect effects of the intervention on workplace safety outcomes via sleep mediators …