Very tired today, but I didn't listen to my body :(

My wakeup HR was 53. I ran this morning, but I felt tired and aborted and came home. My distance was 5.9 miles. I should have rested today. I could tell when I left home that I was tired, but I ignored my body and went out. Fortunately, after 2.9 miles I heeded my body's call for rest and turned around. Violating the 10% rule last Tuesday was a poor idea :(