Sleep related vehicle accidents

Horne, James A.; Reyner, L A · 1995 · OpenAlex-citations

DOI: 10.1136/bmj.310.6979.565

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Summary

This study investigates the incidence, temporal distribution, and driver demographics of sleep-related vehicle accidents in the United Kingdom, addressing a gap in national data where such accidents were not previously identified in official databases. The research was motivated by evidence from other countries indicating that sleep-related crashes cause significant morbidity and mortality, particularly on non-urban roads, and by the need to understand circadian influences on driving safety within the UK context. The authors conducted two surveys using police records. Study One analyzed data from the Devon and Cornwall Constabulary for all road accidents between 1987 and 1992. Police officers were not specifically sensitized to identify sleep-related causes. Study Two involved six Midlands police forces covering motorways during specific months in 1991, 1992, and 1994; here, officers were briefed on sleep-related accidents and used structured interview checklists. Accidents were classified as sleep-related based on strict criteria: blood alcohol below the legal limit, vehicle running off-road or rear-ending another vehicle without braking, no mechanical defects, good weather, elimination of speeding or tailgating, and police suspicion of sleepiness as the primary cause. The study identified 679 sleep-related accidents in total. In Study One, 606 accidents were found, comprising 16% of all police-reported accidents. In Study Two, 73 accidents were identified, representing 23% of motorway accidents. Both studies revealed distinct circadian peaks in accident frequency at approximately 02:00, 06:00, and 16:00, with troughs during typical alert periods (09:00–11:00 and 19:00–21:00). Drivers under 30 years old were disproportionately affected, accounting for nearly half of the accidents in Study One and a majority in Study Two. Male drivers constituted 82% of the sample in Study One and 92% in Study Two. Morbidity was high, with 23% of drivers in Study One suffering death or serious injury, compared to 15% in non-sleep-related accidents. The findings conclude that sleep-related accidents are a substantial component of road safety issues, particularly on monotonous roads like motorways and during circadian low points. The high incidence among young males suggests a combination of increased exposure and heightened physiological vulnerability to sleepiness. The authors note that the lack of normative data on road use by age, sex, and time of day prevents precise calculation of exposure versus risk factors. However, the consistency of results with international data and laboratory studies on circadian alertness validates the conclusions. The study highlights the need for public awareness regarding the dangers of driving while sleepy and underscores the profound influence of circadian rhythms on driving safety.

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Topics

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• circadian factors
• shift work driving
• sleep deprivation