NEW YORK – They snooze in parking garages, on side streets before the afternoon school run, in nap pods rented by the hour or stretched out in bed while working from home. People who make a habit of sleeping on the job comprise a secret society of sorts within the U.S. labor force. Inspired by famous power nappers Winston Churchill and Albert Einstein, today's committed nap-takers often sneak in short rest breaks because they think the practice will improve their cognitive performance but still carries a stigma. Recommended Videos Multiple studies have extolled the benefits of napping, such as enhanced…