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Background  The possibility of residual impairment of cognitive performance after multiday drinking sessions is particularly important given the potential for the deleterious effects of fatigue and hangover. This pilot study aimed to devise a methodology to compare sober performance on driving‐relevant attentional tasks at the end of a 4‐day music festival with performance at varying levels of the breath–alcohol curve.    Methods  Fifty‐two participants completed selective and sustained attention tasks at a breath alcohol concentration (BrAC) of 0.00%, 0.05%, and 0.08% following acute dosing in a controlled laboratory setting. A subset of participants ( n  = 13) were then tested at the conclusion of a 4‐day music festival at 0.00% BrAC, with task performance compared with laboratory results.    Results  During the laboratory phase, sustained attention was poorer at the 0.05% ascending timepoint only (compared to 0.00% BrAC). During the festival phase, participants made a greater number of errors on the selective attention task predeparture than at 0.00% and 0.05% BrAC in the laboratory. Sustained attention performance was poorer while intoxicated in the laboratory.    Conclusions  Our findings suggest that the absence of blood alcohol acutely may not be indicative of unimpaired cognitive performance and that other factors related to multiday drinking may produce driving‐related attentional deficits. The findings reinforce the need to measure attentional performance in real‐world drinking contexts despite the methodological complexities of doing so. A larger study is warranted to replicate the findings and should include attentional measures that either are more sensitive to the effects of acute alcohol intoxication than those in our study or are based on a driving simulator.

Assessing driving‐relevant attentional impairment after a multiday drinking session: A two‐phase pilot study