This. I am more of a "work really intensly for X days until I'm exhausted and never want to see a computer again, then rest for a couple of days while I regain my productivness" person. Also, I've found that if I get up in the morning and do something else other than work before lunch, only to start working in the afternoon, is where I'm at my best in terms of being productive. It's strange that we still operate by these industrialistic workhours, when people clearly are performing at their best at different hours.