1 = 2, right?

My wakeup HR was 48, and I felt pretty good. I left for my two-hour run, but after a mile I could tell I was tired and I slowed down. That didn't help, and after 2 miles I was still tired. I turned around after half an hour and aborted the run, giving me an hour run instead of the two hours I had planned. I could have forced myself to finish the two-hours, but that would have made me tired for my long run on Saturday. I think I was tired this morning because of not sleeping well Monday and Tuesday nights. I did sleep well last night.