I read with interest the Jan. 4 Politics & the Nation Digest item “4 percent of adults slept at the wheel,” about a study done by the Centers for Disease Control and Prevention. The article reported that CDC researchers found that drowsy driving was more common among certain groups, including ”for some unexplained reason — Texans.”

I was not at all surprised by this finding. I suspect that, in order to cross their state’s wide-open spaces, a great many Texans simply activate their cruise controls, and the resulting monotony spurs some drivers to take the opportunity to catch up on their zzz’s.

Ralph Ditano, Washington