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Persistent cognitive activity is an important factor in disturbing sleep-onset both during bedtime and when attempting to get back to sleep after nocturnal awakenings. One of the most specific self-report measures designed to assess this feature is the Glasgow Content of Thoughts Inventory (GCTI). In this study, we investigated the preliminary psychometric properties of GCTI in a large sample of higher education European Portuguese students (N = 2995). Our results suggest that there is evidence of good internal consistency (α = .93) and validity indicators. Moreover, we found an interpretable factorial structure comprising five correlated factors that needs to be confirmed in future studies. The European Portuguese version of the GCTI appears to be a reliable and valid instrument for measurement of sleep-onset disturbing cognitions.


Journal article


Behavioral medicine (Washington, D.C.)

Publication Date



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b Institute for Biomedical Imaging and Life Sciences, IBILI, Azinhaga de Santa Comba , 3000-548 Coimbra , Portugal.