On our run yesterday we were chatting about days off and how great they are. Considering how most runners have, at one time or another, considered "streaking" it seems to me that some of us can become obsessed to a fault, I know I have from time to time. These days, taking a day off now and then seems a sensible thing to do. Certainly for me, in my "age and stage" of life, these days provide a wonderful opportunity to rest and recover as well as to prepare for the next phase in training. It also helps me psychologically and emotionally to declare them days off as early as possible.
Today is one of those days!
Here's a good article on the topic.