"The survey did not precisely define what constitutes a nap..."

“The Pew Research Center Social and Demographic Trends survey of daily activities found that people who were unemployed were more likely to nap during the week than on weekends and that those with jobs were only slightly more likely to nap on weekends. The survey also asked whether people had trouble sleeping, presumably at night. Women were more likely to, as were people who make less than $20,000 a year and those who, regardless of their income, were dissatisfied with their personal financial situation. The survey did not precisely define what constitutes a nap. Some people claim they are just resting their eyes when they are really snoozing. Others may doze momentarily when reading articles about demographic trends. Still others are driven to nod off briefly by the swaying of their bus or commuter train.”

–New York Times, July 31, 2009