too much rest?

I still get tired between 8 and 9 at night, but the last 3 days I have been up well before the crack of dawn. I've got plenty of energy during the day so I guess it must be the lack of running because that's the only thing I am doing differently. It's weird... I can actually feel my body sort of healing and tightening up and storing energy, like my muscles are springs waiting to be released. Yesterday's 2 miles felt really good. So I think I will feel really good at least through the first part of the marathon.