“…For example, the prevalence of sleep disturbances as measured by the presence (yes/no) of any sleep complaint (DIS, DMS, EMA or NRS) ranges between 1.6 and 76.3% in the general population (Kim et al ., ; Ohayon and Paiva, ; Ohayon and Sagales, ; Ohayon and Smirne, ; Ohayon et al ., ; Rocha et al ., ). In contrast, the prevalence of sleep disturbances as defined by dissatisfaction with sleep quality or quantity, or subjective poor sleep ranges between 7.0 and 50.5% (Nowicki et al ., ; Ohayon, ; Ohayon and Paiva, ; Ohayon and Partinen, ; Ohayon and Smirne, ; Ohayon et al ., ). Using screening instruments such as the Pittsburgh Sleep Quality Index (PSQI) or the Athens Insomnia Scale (AIS), the prevalence of sleep disturbances ranges between 25.3 and 38.2% (Madrid et al ., ; Paparrigopoulos et al ., ; Soldatos et al ., ).…”