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Excessive sleepiness, reported in 20% to 25% of the population, is associated with increased rates of self-reported motor vehicle accidents. These researchers examined the rate of verified motor vehicle accidents over a 10-year period in 618 randomly selected participants in a larger community-based study on daytime sleepiness (age range, 18–65) who were assessed with an objective laboratory measure of physiological sleepiness, the Multiple Sleep Latency Test (MSLT).
Participants were placed into three groups according to MSLT results: excessively sleepy (sleep latency, ≤5 minutes), moderately sleepy (5–10 minutes), and alert (>10 minutes). During the 10-year follow-up, excessively sleepy subjects were significantly more likely than alert su…