Grewe FA, Roeder M, Bradicich M, et al. - In this investigation involving 40 candidates (mean age 47.7 ± 15.4 years), researchers assessed the short-term repeatability of Epworth Sleepiness Scale (ESS) in individuals with suspected obstructive sleep apnoea (OSA), and if transitory sleepiness of the patient influenced ESS-results. In a study on the diagnostic accuracy of repeated sleep studies, adult patients with suspected OSA were eligible. Even when repeated on the same day, a clinically relevant variation in ESS-scores was observed, possibly due to situational sleepiness affecting ESS-results. Discrepancies between sequential ESS-scores of at least 3 points have been observed in 48% of all candidates. Changes in ESS should be viewed with caution because of its low test-retest-reliability in response to interventions.