Depends on the time of year..
During the summer I will usually ride everyday of the week, accept Sunday's. If I am doing a lot of long rides I will take every 4th day off and ride in sets of days of 3. Sometimes I will ride the 4th day and just make it a short ride. During the winter, I ride whenever it's not raining, it could be everyday, or I might just ride a couple a days a week. But to answer your question, my body usually does not like to ride on Sundays, but this time of year I'll get out whenever I can. Being retired and not having to do the "W" thing, makes life a little bit easier. I just at mercy to the weather. I just have to know when my body needs rest. Probably Friday is your wind down day and you're bone tired from working all week, so if your body says don't ride, don't. I look at a cycling week as riding 6 days in a 7 day period, it doesn't matter which day I take off.