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

Hitomi Ogata (), Tomohiro Nishikawa, Momoko Kayaba, Miki Kaneko, Keiko Ogawa and Ken Kiyono
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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

IJERPH, 2022, vol. 19, issue 19, 1-11

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.

Keywords: sleeping in a car; sleep architecture; seat angle; subjective sleep quality; calculation performance (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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