I am planning to ride my first century on Sunday. I have done a 72 miler this summer, and a normal Saturday ride is about 45 miles. I commute to work on my bike, 18 miles RT, and since I have a shower at work I treat it as workout both ways.

So, here's the question: do I just keep riding as normal till Sunday, or do I need to take a couple of days off before the ride? Or whatever?