My Google alerts just turned up an interesting article from the The New Yorker. Apparently, after publishing a book on the benefits of napping on the job, Workman Publishing (one of the largest and most celebrated independents) decided to give it a try themselves. So now they're all jamming themselves into nooks and crannies to catch a few Zs, not unlike a scene from Dr. Seuss's Sleep Book.
I dunno. On one hand, this could be a boon on those days when you're not feeling well or were up at all hours with a teething toddler. But something like this seems like it would be easy to abuse--on both sides. Hungover slackers might take more than a short cat-nap. Employers might use the priviledge to justify asking people to work extended hours. I think I'd rather just get my work done and then go home and sleep in my own bed.