do you have a nap during your work

Sometimes it is not a matter of choice. :P Some companies allow naps during e.g. lunch time and you can see all lights off and everyone lining like logs at their favorite spots. Other companies have allocated time for "power naps" in special rooms even. Some super nice companies allow you to take your own initiative. I guess if I had the choice, I still wouldn't take a nap - unless I am really very tired - or if I had worked through the night the previous day.