“…Detailed sleep information was gathered with the 19-item Pittsburgh Sleep Quality Index (PSQI), 17 which yields a reliable and stable total score that is 90% sensitive and 87% specific for probable insomnia, as well as subscales reflecting subjective sleep quality, sleep latency, sleep duration, habitual sleep efficiency, sleep disturbances, medication use, and daytime dysfunction. Beliefs about sleep were measured with the Dysfunctional Beliefs About Sleep (DBAS) scale, 18 which assesses misconceptions about insomnia causes, misattributions about its consequences, excessive expectations of sleep amount, control over and predictability of sleep, and erroneous beliefs about insomnia remediation. The Epworth Sleepiness Scale (ESS) 19 was used to assess propensity for unintended dozing in several daytime situations; this widely used 8-item instrument has acceptable validity, test-retest reliability, and internal consistency.…”