Day 41 -tiered and still running

Today's Stats: 3miles, 4.83km in 28:14, avg pace 5:51/km burned 410 cal, runs seem to be going pretty good these days but I have to say, I"m tiered and my muscles are tight. Not sure if this is normal or if I'm getting to a new level of performance but I am awfully tiered. I'm sleeping 8 hrs a night but in pain some of the hours so not sleeping a full night like I should. So I guess the only thing I can think of doing is rest whenever I can, put my feet up as my legs are super tiered and fuel my body with lots of good food. Hope to turn around soon!