Too sleepy to drive: self-perception and regulation of driving when sleepy

Paper


Watling, Christopher N. and Smith, Simon S.. 2012. "Too sleepy to drive: self-perception and regulation of driving when sleepy." Occupational Safety in Transport Conference (OSIT 2012). Gold Coast, Australia Kelvin Grove, Australia.
Paper/Presentation Title

Too sleepy to drive: self-perception and regulation of driving when sleepy

Presentation TypePaper
AuthorsWatling, Christopher N. (Author) and Smith, Simon S. (Author)
Journal or Proceedings TitleProceedings of the Occupational Safety in Transport Conference (2012)
Number of Pages10
Year2012
Place of PublicationKelvin Grove, Australia
ISBN9781921897535
Conference/EventOccupational Safety in Transport Conference (OSIT 2012)
Event Details
Occupational Safety in Transport Conference (OSIT 2012)
Event Location
Gold Coast, Australia
Abstract

Background: Sleepiness is a direct contributor to a substantial proportion of fatal and severe road cashes. A number of technological solutions designed to detect sleepiness have been developed, but self-awareness of increasing sleepiness remains a critical component in on-road strategies for mitigating this risk. In order to take appropriate action when sleepy, drivers’ perceptions of their level of sleepiness must be accurate.

Aims: This study aimed to assess capacity to accurately identify sleepiness and self-regulate driving cessation during a validated driving simulator task. Participants: Participants comprised 26 young adult drivers (20-28 years). The drivers had open licenses but no other exclusion criteria where used.

Methods: Participants woke at 5am, and took part in a laboratory-based hazard perception driving simulation, either at mid-morning or mid-afternoon. Established physiological measures (including EEG) and subjective measures (sleepiness ratings) previously found sensitive to changes in sleepiness levels were utilised. Participants were instructed to ‘drive’ until they believed that sleepiness had impaired their ability to drive safely. They were then offered a nap opportunity.

Results: The mean duration of the drive before cessation was 39 minutes (±18 minutes). Almost all (23/26) of the participants then achieved sleep during the nap opportunity. These data suggest that the participants’ perceptions of sleepiness were specific. However, EEG data from a number of participants suggested very high levels of sleepiness prior to driving cessation, suggesting poor sensitivity.

Conclusions: Participants reported high levels of sleepiness while driving after very moderate sleep restriction. They were able to identify increasing sleepiness during the test period, could decide to cease driving and in most cases were sufficiently sleepy to achieve sleep during the daytime session. However, the levels of sleepiness achieved prior to driving cessation suggest poor accuracy in self-perception and regulation. This presents practical issues for the implementation of fatigue and sleep-related strategies to improve driver safety.

Keywordssleepiness; participants; levels; sleepy; subjective; occupational; drivers; perception; crashes; hazard
ANZSRC Field of Research 2020420604. Injury prevention
520206. Psychophysiology
520404. Memory and attention
Public Notes

File reproduced in accordance with the copyright policy of the publisher/author.

Byline AffiliationsQueensland University of Technology
Institution of OriginUniversity of Southern Queensland
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