Effects of Coffee and Napping on Nighttime Highway Driving

  1. Andrew J. Yee, MD
  1. From Massachusetts General Hospital Cancer Center, Boston, Massachusetts.

    TO THE EDITOR:

    Philip and colleagues (1) have validated the conventional wisdom that coffee and napping improve nighttime highway driving performance with their real-life study. However, their study raises several questions.

    First, an alternative factor affecting the ability to drive at night is nighttime visual acuity. One of the 12 study participants (participant 7) was egregiously the worst driver under all 3 nighttime test conditions: 13 …

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    1. Ann Intern Med February 6, 2007 vol. 146 no. 3 229
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