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Effect of Seat Angle when Sleeping in a Car on Quality of Sleep and Its Impact on Calculation Performance the Following Day

Author

Listed:
  • Hitomi Ogata

    (Graduate School of Humanities and Social Sciences, Hiroshima University, Hiroshima 739-8521, Japan)

  • Tomohiro Nishikawa

    (Graduate School of Humanities and Social Sciences, Hiroshima University, Hiroshima 739-8521, Japan)

  • Momoko Kayaba

    (Department of Somnology, Tokyo Medical University, Tokyo 160-0023, Japan)

  • Miki Kaneko

    (Graduate School of Engineering Science, Osaka University, Osaka 565-8531, Japan)

  • Keiko Ogawa

    (Graduate School of Humanities and Social Sciences, Hiroshima University, Hiroshima 739-8521, Japan)

  • Ken Kiyono

    (Graduate School of Engineering Science, Osaka University, Osaka 565-8531, Japan)

Abstract

The number of occasions to stay in a car overnight is increasing during disasters; however, the effects on sleep and the impact on daytime functioning are not well understood. We investigated the effect of seat angle when sleeping in a car and its impact on calculation performance the following day. Fifteen healthy males participated in three trials (sleeping in a car with the front seat angled at 45° and 60° in a laboratory and sleeping at home); sleep and calculation performance the following day were compared. Increased wake after sleep onset and decreased slow-wave sleep were observed in the 60° trial, that is, near-vertical, compared with the others. Subjective sleep quality and calculation performance in the 45° and 60° trials were poorer than those in the home trial. The effect of seat angle on sleep was confirmed objectively, but not subjectively, suggesting that a large seat angle might cause sleep impairment.

Suggested Citation

  • Hitomi Ogata & Tomohiro Nishikawa & Momoko Kayaba & Miki Kaneko & Keiko Ogawa & Ken Kiyono, 2022. "Effect of Seat Angle when Sleeping in a Car on Quality of Sleep and Its Impact on Calculation Performance the Following Day," IJERPH, MDPI, vol. 19(19), pages 1-11, September.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:19:p:12270-:d:926750
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    References listed on IDEAS

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    1. Hitomi Ogata & Momoko Kayaba & Miki Kaneko & Keiko Ogawa & Ken Kiyono, 2020. "Evaluation of Sleep Quality in a Disaster Evacuee Environment," IJERPH, MDPI, vol. 17(12), pages 1-12, June.
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