Counteracting driver sleepiness: effects of napping, caffeine, and placebo.

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  • Author(s): Horne JA;Horne JA; Reyner LA
  • Source:
    Psychophysiology [Psychophysiology] 1996 May; Vol. 33 (3), pp. 306-9.
  • Publication Type:
    Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't
  • Language:
    English
  • Additional Information
    • Source:
      Publisher: Blackwell Country of Publication: United States NLM ID: 0142657 Publication Model: Print Cited Medium: Print ISSN: 0048-5772 (Print) Linking ISSN: 00485772 NLM ISO Abbreviation: Psychophysiology Subsets: MEDLINE
    • Publication Information:
      Publication: Malden, MA : Blackwell
      Original Publication: Baltimore, Williams & Wilkins.
    • Subject Terms:
    • Abstract:
      Sleepy drivers should "take a break," but the efficacy of feasible additional countermeasures that can be used during the break is unknown. We examined a shorter than 15 min nap, 150 mg of caffeine in coffee, and a coffee placebo, each given randomly across test sessions to 10 sleepy subjects during a 30-min rest period between two 1-hr monotonous early afternoon drives in a car simulator. Caffeine and nap significantly reduced driving impairments, subjective sleepiness, and electroencephalographic (EEG) activity indicating drowsiness. Blink rate was unaffected. Sleep during naps varied, whereas caffeine produced more consistent effects. Subjects acknowledged sleepiness when the EEG indicated drowsiness, and driving impairments were preceded by self-knowledge of sleepiness. Taking just a break proved ineffective.
    • Accession Number:
      0 (Central Nervous System Stimulants)
      3G6A5W338E (Caffeine)
    • Publication Date:
      Date Created: 19960501 Date Completed: 19970102 Latest Revision: 20190830
    • Publication Date:
      20240513
    • Accession Number:
      10.1111/j.1469-8986.1996.tb00428.x
    • Accession Number:
      8936399