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Study protocol indicating timing of drink administration (12:30), ocular motor tasks (between 13:00–13:15) and PVT (between 13:30–13:45). Timing of drink administration, testing, breathalyzer tests (○) and Karolinska Sleepiness Scale ratings (Δ) are shown. Participants were discharged from the laboratory when breath alcohol concentration had returned to < 0.02%. PVT, Psychomotor Vigilance Test.
