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Sleep problems are the major reported consequence of working on shifts. The specificity of working on rotating shifts is not always captured by the instruments used in other samples. The Bergen Shift Work Seep Questionnaire (BSWSQ) is a self-report tool able to identify insomnia symptoms’ presence and severity and distinguish differences by shift and rest days/vacations. The aim of the current study was to present preliminary psychometric properties of the European Portuguese version of the BSWSQ. Data from 569 shift workers in a Portuguese paper industry were collected and analysed. The results indicated good internal consistency and significant correlations among insomnia symptoms, depression, anxiety, and stress. The insomnia scores considering the various shifts were significant differents. Almost 63% of the shift workers were classified as having “shift-related insomnia”. ROC analysis found optimal cut-offs for the presence of insomnia in each shift and rest days/vacations. A Confirmatory Factor Analysis showed excellent fit. The BSWSQ seems to be a measure with good psychometric properties, capable of evaluate the presence and severity of insomnia symptoms related to each shift. However, more studies are necessary, specifically with other shift-work samples.

The Bergen Shift Work Sleep Questionnaire (BSWSQ) – European Portuguese validation in a sample of shift workers from the paper industry