The Pew Research Center, besides having a silly name, has just released a study that sheds light on the recreational activity we refer to as napping.---
Overall, the study
found a correlation between naps and unhappiness. People who aren't happy are more likely to nap on a given day than are happy people. This fits in somewhere with the finding that unhappy adults are much more likely to have sleep troubles the night before, prompting them to nap later.
It also found that napping is quite common at low-income demographics. Some 42% of adults with an annual income below $30,000, including many unemployed, said they napped in the past day. As income rises, napping declines. However, at the upper end of the scale (adults whose annual income is $100,000 or above) the tendency to nap revives and reverts to the mean. This makes sense; the unemployed and the very rich both don't have much to do.%uFFFD