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The characteristics of sleepiness during real driving at night - a study of driving performance, physiology and subjective experience
Stockholm University, Faculty of Social Sciences, Stress Research Institute.
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2011 (English)In: Sleep, ISSN 0161-8105, E-ISSN 1550-9109, Vol. 34, no 10, 1317-25 p.Article in journal (Refereed) Published
Abstract [en]

STUDY OBJECTIVES: Most studies of sleepy driving have been carried out in driving simulators. A few studies of real driving are available, but these have used only a few sleepiness indicators. The purpose of the present study was to characterize sleepiness in several indicators during real driving at night, compared with daytime driving.

DESIGN: Participants drove 55 km (at 90km/h) on a 9-m-wide rural highway in southern Sweden. Daytime driving started at 09:00 or 11:00 (2 groups) and night driving at 01:00 or 03:00 (balanced design).

SETTING: Instrumented car on a real road in normal traffic.

PARTICIPANTS: Eighteen participants drawn from the local driving license register.

INTERVENTIONS: Daytime and nighttime drives.

MEASUREMENT AND RESULTS: The vehicle was an instrumented car with video monitoring of the edge of the road and recording of the lateral position and speed. Electroencephalography and electrooculography were recorded, together with ratings of sleepiness every 5 minutes. Pronounced effects of night driving were seen for subjective sleepiness, electroencephalographic indicators of sleepiness, blink duration, and speed. Also, time on task showed significant effects for subjective sleepiness, blink duration, lane position, and speed. Sleepiness was highest toward the end of the nighttime drive. Night driving caused a leftward shift in lateral position and a reduction of speed. The latter two findings, as well as the overall pattern of sleepiness indicators, provide new insights into the effects of night driving.

CONCLUSION: Night driving is associated with high levels of subjective, electrophysiologic, and behavioral sleepiness. CITATION: Sandberg D; Anund A; Fors C; Kecklund G; Karlsson JG; Wahde M; Åkerstedt T. The characteristics of sleepiness during real driving at night-a study of driving performance, physiology and subjective experience. 

Place, publisher, year, edition, pages
2011. Vol. 34, no 10, 1317-25 p.
National Category
Medical and Health Sciences
URN: urn:nbn:se:su:diva-63675DOI: 10.5665/SLEEP.1270ISI: 000295624800008PubMedID: 21966063Local ID: P2880OAI: diva2:451671
Available from: 2011-10-26 Created: 2011-10-26 Last updated: 2012-01-16Bibliographically approved

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Kecklund, GöranÅkerstedt, Torbjörn
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