Obviously, if you worked very hard on a Friday, left at say 7:30 pm, crashed, then if you slept in until 10:30 am, ate a leisurely lunch at noon, no one would fault you. But, if over a golden weekend off, you didn't do *any* reading, or any reading ever on a day off it will catch up with you. Remember, it is hard to get quality reading time in after a work day, i.e. for a couple of hours at night, although you should try. The days off are perfect because you can sit down for several hours and actually read something and concentrate solely on that. You can't learn medicine solely "on the job", i.e. learning by doing, you have to read as well. Nothing is more annoying for us med students who study everyday, and hard studying residents and attendings, to have a resident who yaps about going out on the weekend and obviously is behind in their knowledge/management base.