Does power nap help? My personal experience.

Throughout my life, I have been the person who sleeps just once in a day. Be it for 4 hours or 15, but its only once. Recently, observing some people, I have felt lazy in afternoons and tried to sleep. The power naps have brought serious downturn in my productivity and the only thing I look up to is to get a nap.
Am not sure what it is, but thats the case with me..
People out there beware :)