“…The Dutch version of Von Zerssen's AMS (Von Zerssen, 1976;Elsenga, 1988), which measures depressed mood; the ActivationDeactivation Adjective Checklist (Thayer, 1967), which measures four components of activation (energy, tension, calmness, and tiredness); the Stanford Sleepiness Scale (Hoddes et al, 1973); and a Visual Analog Scale (VAS), which measures depressed mood, anger, anxiety, and elation (Albersnagel, 1988), were completed three times daily at 9:00, 17:00, and 22:00 h. The Sleep Quality Scale (Mulder-Hajonides v.d. Meulen et al 1980) was completed daily at 9:00 h. Depressed mood also was assessed with the Beck Depression Inventory (BDI) (Beck and Steer, 1987) on the mornings of Day 1 (the first day of EL and last day before ML) and Day 4 (the first day after EL and last Gordijn et al / NONSEASONAL DEPRESSION 135 day of ML) of each experimental week and on the morning of the first day of Week 6.…”