I voted 1-2 times a week but it is much less than that. Even when I do, it is like 5 minutes but it feels like I slept for an hour. I wish I could do it more often.
I only nap when I'm really really tired. That groggy, just woke up feeling is too unpleasant to experience more than once a day. Though I will admit that napping can be quite rejuvenating at times. Only 40 mins at the very most though.