Even though my wakeup heart rate was 51 this morning (and yesterday morning), I was tired during my 7 miles. I held up pretty good, although I took frequent walking breaks during the last couple of miles. I've slept well the past two nights, but my body needs additional time to recover from my couple days of inadequate sleep. Unless I really pep up on my Saturday run, I'll run 7 miles next week, too.
Today was a nice day for running. Lots of sun, and the temperature was in the low 50s (F) when I left, but there was a cool breeze. After a couple of miles, I removed my wind breaker.