Interestingly the british english corpus has a fairly even reference to napping. Though there is a slight downward trend to the graph. I have also included nap

Interestingly the british english corpus has a fairly even reference to napping. Though there is a slight downward trend to the graph. I have also included napping and siesta in the plot. These have a fairly constant use. http://books.google.com/ngrams/graph?content=nap%2Cnapping%2Csiesta&year_start=1800&year_end=2000&corpus=18&smoothing=1&share= http://books.google.com/ngrams/graph?content=nap%2Cnapping%2...