http://www.youtube.com/watch?v=vPhyAqgfotU
Works like a charm, have used it many times.
To the person saying grad school is a lot of back patting, either get in a hard science field, or go to a school with a good reputation in your field. I typically worked 12 hour days in grad school, 6 days a week, and usually in on Sundays for a few hours as well.