What's good about procrastination?

I just cancelled an appointment, and have spent the last thirty minutes stretched out on the carpet, cuddling my dogs. I’ve ignored housework and the fact that I could be planning lessons.

I feel much better than I did before. This got me thinking. Could procrastination be useful and even necessary, to keep us healthy? I’m not talking about forced breaks (though I’m a fan of those), but rather, listening to our minds.