Day off

I had to take today off and yesterday easy because my legs were trashed. I kept pondering how could my legs be trashed nearing the end of a 75 mile week when I wanted to max out at 85? I think I finally figured out the answer to that question.
It appears that my troubles began last Sunday when I struggled mightily to finish my long run. I knew it was bad and I had originally planned to take it easy until Wednesday. Well I ended up going hard on Tuesday and that was when things really went awry. I didnt feel too bad Wednesday but I should have known it would have caught up to me later.
All that has lead me to taken today off and completely unsure of what kind of mileage I will hit next week.