Ran for 1 mile and aborted my run

I didn't have a lot of energy when I began the run, and after 1/2 mile I decided to abort. My wakeup heart rate was 55, and I felt pretty good (energy wise) this morning, but when 5 pm came and I left to go running, my energy was gone. I ran this afternoon instead of this morning so my wife could come for her 2-mile walk. Hope I feel better on Wednesday.