I'd guess the guy talking about burn out might be correct. Try working less for a while and take up a totally different hobby. If you don't get exercise, start

I'd guess the guy talking about burn out might be correct. Try working less for a while and take up a totally different hobby. If you don't get exercise, start doing it. [Edit: The advice below to go Voltaire and get a garden might be good.] Some other possibly reasons, from mine (and others) lives. Check physical health. "Random" examples: Sleep apnea. Bacteria infection. Some weird allergy/food intolerance. Change where you work, eat and sleep. [Edit: From comment below it seems you've had this long enough and in enough jobs to know this isn't true.] You might have problems relaxing when not working, try a course in meditation. [Edit: You took time from comment, so this is probably not it, either.]