Prior sleep and perceptions of risk when driving

Fatigue represents a significant driving risk. One predictor of fatigue, and driving impairment, is prior sleep length. However, it is currently unknown how much sleep driver’s perceive as necessary to drive safety. This may be an important contributor to a driver’s decision about whether they are safe to drive. There is also evidence that reduced prior sleep leads to increased risk-taking. The aim of this study was to investigate community perceptions regarding sleep duration and fatigued driving, and to determine if sleep duration influences risk perception in relation to fatigued driving. 1081 participants completed a telephone survey addressing sleep history, fatigued driving, and risk perception. The majority of the sample (62.4 %) thought a minimum of 6–8 h sleep was necessary to drive safely, however a small percentage (5.6 %) felt that less was necessary or reported that they did not know. Women tended to report that individuals need more hours of sleep to drive safely. Younger age and male gender were both associated with an increased likelihood of reporting having driven despite feeling too tired, and male gender alone with being more likely to report falling asleep at the whee