Early evening low alcohol intake also worsens sleepiness-related driving impairment

Following night‐time sleep restriction, afternoon driving performance during the bi‐circadian surge in afternoon sleepiness is markedly worsened by blood alcohol concentrations (BACs) well under most national driving limits. This study assessed how driving with this same sleep restriction and BACs (av 40 mg and 28 mg alcohol/100 ml blood at the beginning and end of drive, respectively) respond during the evening circadian rise in alertness. In a...