When I am off balance (e.g., sicker than usual or have suffered any sort of significant setback) trivial inconveniences are not enough to prevent my brain from procrastinating.

If my brain has to really think to get around the obstacle, just the act of its getting into the problem-solving state and staying in it for half a minute has always been enough AFAICR for it to realize that it does not actually want to solve the problem. In fact, it usually stops trying to get around an obstacle to procrastination after just five or ten seconds of being in the state necessary to solve an open-ended computer problem. But if my brain can figure out how to get around the obstacle fast enough, the obstacle's days are numbered.