I've been starting to do this over the last week or so as an experiment. It's too short a time span to give me any useful data, but so far my impressions are positive. I've gotten less work done than usual but feel considerably less stressed, which is a net win in my view.

If anyone is interested in this sort of thing, read through the articles in the study hacks blog - http://www.calnewport.com/blog/. It's aimed at students but I've found it interesting and somewhat inspiring nonetheless.