Sleepiness in Professional Drivers: Effect of Age and Time of Day

Sleepiness and low-alertness are responsible for many work related traffic accidents. Increased driving time is known to be a factor in the degradation of a driver's alertness level. Occurrence of sleepiness is also promoted by night driving. Driving duration and time of day are not the only factors affecting a driver's level of alertness. The driver's age and/or his/her driving experience are also relevant. According to the above assumptions, this study hypothesized that young professional drivers (20-30 years) will be less alert and sleepier than middle aged professional drivers (48-52 years) while driving, particularly on conditions such as on a highway with a low traffic density. The study's results demonstrated that young professional drivers showed a significant decrease in alertness in the low traffic condition and showed a strong increase in sleepiness during night time driving.


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  • Accession Number: 01004198
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Sep 19 2005 8:47AM