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Work-related stress is a major occupational health problem. Prominent symptoms are impaired sleep and cognitive ability. Participants (N 102) were randomized to either an intervention or a wait-list control group. Outcomes, measured at baseline, 3, 6, and 9 months, were the Basic Nordic Sleep Questionnaire, Cognitive Failures Questionnaire, and Digit Span test. Data were analyzed using repeated measures analyses of variance. Selfreported quality of sleep improved in the intervention group. Relative to the control group, an effect size of d 0.64, CI 1.05, – 0.24, was found. For cognitive failures, an effect size of d 0.57, CI 0.90, – 0.24, was found, favoring the intervention. Gains were maintained at follow-up. Digit Span scores did not differ between groups. In conclusion, the intervention had medium effects on self-reported sleep and cognitive errors.
Willert et al. (Sun,) studied this question.