Obviously if you are able to, but I do know people who are of my age or older who do take a nap during the day.Just recently I have fallen asleep every day without fail between 5pm and 6pm and wondered if perhaps I wouldn't do this if I took a nap in the afternoon but then I don't think I would be able to sleep when I go to bed.
As soon as I pick up the evening paper I nod off usually between 5 and 6pm usually for half an hour. Don't know how I manage to keep the paper open at the same page but I do.