El, I've never heard of a "cruising" type period on 5x5, but I don't see why it would hurt any. How many weeks have you been on it? It may be a good idea to stop entirely for a week or two, and come back to it. You'll surely decondition the muscle enough and when you begin anew, tear shit up.
I have a question of my own. When you start, you know how you're supposed to begin a month behind? Like Lavi said, 20 lbs. under (assuming 5 lb. incretments) a weight you can handle for 1x8? Well, during that time, is it imperative that you still eat big, or can you conserve some of your food and eat moderately, since during that time, for the most part, gains won't come because the weights are going to be so easy for you. It just feels kind of like a waste to me, to eat so much when the numbers with your lifting are so little (relative to what you can do).