A day when you don't feel like you're being productive, even though you're trying to get something done. One of my coworkers wrote a good article (https://mediu

A day when you don't feel like you're being productive, even though you're trying to get something done. One of my coworkers wrote a good article (https://medium.com/@jdan/quantifying-my-off-days-27e85f5bc157#.r59f6hnrd https://medium.com/@jdan/quantifying-my-off-days-27e85f5bc15...) about that, linking it to pomodoro techniques.