Michael Arnott, of Cambridge, Mass., says he used to have trouble staying awake on long drives. Sleep specialists discovered he has obstructive sleep apnea, though not for the most common reasons — he isn't overweight, and doesn't smoke or take sedatives. M. Scott Brauer for NPR hide caption

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People in a crowd flee as an out-of-control monster truck plows through spectators at a Mexican air show in the city of Chihuahua Saturday. Officials say they are investigating the incident, in which eight people died. AP hide caption

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A woman uses a cellphone while driving in Los Angeles in 2011. Damian Dovarganes/AP hide caption

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The wreckage of a hot air balloon and its gondola lay in a field near Luxor, Egypt, on Tuesday. A fire and subsequent crash killed many of those who were aboard the tourist flight. Reuters /Landov hide caption

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