- Participants with normal scores on the Pittsburgh Quality of Sleep Questionnaire [78] (global score <5) and Epworth Sleepiness Scale [79] (score <10), no indication of sleep apnea (Berlin Questionnaire) [80], sleep disorders (Sleep Disorders Inventory Questionnaire) [81], depression (Beck Depression Inventory II) [82], significant delayed or advanced sleep phase (Composite Scale of Morningness/Eveningness) [83], and involuntary sleep movement, by self-report.