Drowsy driving is a factor in almost 10% of crashes, study finds

(CNN) — Drowsy drivers are a bigger risk factor in vehicle accidents than previously thought, according to a study published Thursday.And the problem gets worse when darkness falls. The research, carried out by the AAA Foundation for Traffic Safety, found that the “proportion of crashes in which drowsiness was evident was over three times as great during the nighttime hours,” according to Brian Tefft, a senior researcher at the foundation.The researchers continuously