The Good Sleeper Scale‐15 items: a questionnaire for the standardised assessment of good sleepers

Summary Research with ‘good sleepers’ is ubiquitous, yet there are no standardised criteria to identify a ‘good sleeper’. The present study aimed to create and validate a questionnaire for identifying good sleepers for use in research studies known as the Good Sleeper Scale‐15 items (GSS‐15). Data were derived from a population‐based survey of Australian adults (n = 2,044). A total of 23 items were chosen for possible inclusion. An exploratory factor analysis (EFA) was conducted on ~10% of the survey dataset (n = 191) for factor identification and item reduction. A confirmatory factor analysis (CFA) was conducted on the remaining data (n = 1,853) to test model fit. Receiver operating characteristic curves and correlations were conducted to derive cut‐off scores and test associations with sleep, daytime functioning, health, and quality‐of‐life. The EFA identified six factors: ‘Sleep Difficulties’, ‘Timing’, ‘Duration’, ‘Regularity’, ‘Adequacy’, and ‘Perceived Sleep Problem’. The CFA showed that model fit was high and comparable to other sleep instruments, χ2 (63) = 378.22, p