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Diagram of the study procedure. Neuro-Tests indicate numbers of the bihourly testing sessions of Karolinska Drowsiness Test, Psychomotor Vigilance Task, AusEd driving simulator, and Karolinska Sleepiness Scale in each testing day. D, day; Db, baseline day; N, night; Nb, baseline night; ovals, administration of 200 mg modafinil; rectangles, administration of placebo; CPAP, continuous positive airway pressure.
