Workers of the world, come clean: Who among us hasn't laid our head on the table, dozed off on a conference room couch, or curled up behind our desk in the middle of the day? Don't feel guilty. You're not alone. The Pew Research Center reported in 2009 that about 34 percent of adults surveyed had napped during the previous day. We are an exhausted crew. Most working Americans sleep six or less hours a night, instead of the recommended 7 to 9 hours.