Ran four days in a row. Normally I only run 2 or 3 days a week with at least one day of rest in between.

Had been thinking more frequency might be a good idea. From past experience and reading this article:
http://www.pponline.co.uk/encyc/0058.htm
Yet running stops being fun then and I get kind of tired for other things in life. Anyway, this fourth day just ran one mile in 3/1 intervals (as I have to work 14+ hours next three days) and I'm getting pretty tired. At the track did it in 7:48 which isn't bad at all. One short term goal is to run 3 miles in 3/1's in under 24 minutes. Not to that yet but improving. Doing all intervals of 1 to 3 minutes.