Driver fatigue

Title: Driver sleepiness: comparisons between young and older men during a monotonous afternoon simulated drive

Organisation: University of Loughborough, Sleep Research Unit
Date uploaded: 25th January 2013
Date published/launched: March 2012

This study assessed the effect of a normal night's sleep vs. prior sleep restricted to five hours on prolonged afternoon simulated driving in 20 younger and 19 older healthy men.

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Young men figure prominently in sleep-related road crashes. Non-driving studies show them to be particularly vulnerable to sleep loss, compared with older men.

This study assessed the effect of a normal night's sleep vs. prior sleep restricted to five hours, in a counterbalanced design, on prolonged (two hours) afternoon simulated driving in 20 younger and 19 older healthy men.

Driving was monitored for sleepiness related lane deviations, EEGs were recorded continuously and subjective ratings of sleepiness taken every 200 seconds.

Following normal sleep there were no differences between groups for any measure. After sleep restriction younger drivers showed significantly more sleepiness-related deviations and greater 411 Hz EEG power, indicative of sleepiness. There was a near significant increase in subjective sleepiness.

Correlations between the EEG and subjective measures were highly significant for both groups, indicating good self-insight into increasing sleepiness. The study confirms the greater vulnerability of younger drivers to sleep loss under prolonged afternoon driving.

For more information contact:
Dr Jim Horne

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