I disagree with the premise of this article (though I haven't always). I generally find that I'm always in the zone for _something_, and after more than a decad

I disagree with the premise of this article (though I haven't always). I generally find that I'm always in the zone for _something_, and after more than a decade writing code I've found that often when I'm feeling less productive at it, it's because there is some deficiency in my life, be it social interaction, nutrition, fitness, over-exertion, etc. Over the years I've come to know myself better, which allows me to take better care of myself holistically in order to be not just more productive at work, but more content with life in general. Keep everything in it's proper place and all that.