The article “Smartphone Nation” (AARP Bulletin, September 2009) described a study of how people ages 50 to 64 years use cell phones. In this study, each person in a sample of adults thought to be representative of this age group was asked about whether he or she kept a cell phone by the bed at night. The researchers conducting this study hoped to use the resulting data to learn about the proportion of people in this age group who sleep with their cell phone nearby.