Is it okay to use Obagi-C Clarifying serum at night before Obagi night cream?

I have started using the Obagi-C RX system. According to the directions, the Clarifying Serum should be applied in the morning. However, the serum tends to make my face look shiny. Can anyone answer me if its okay to apply the serum at night instead before applying the night cream? Thanks!Is it okay to use Obagi-C Clarifying serum at night before Obagi night cream?
i have never used it but i can give you a tip on how to keep it from being shiny once it dries on your face take a towel and kind of rub it lightly and it will lose the shine i have to d that with mine every morning