I had a nice 5-mile run this afternoon. There was a light rain during the first half hour, and then the rain stopped but the sky remained cloudy. The temperature was in the mid 40s (F). I felt good during the run. I don't think I went as fast as I did on Saturday, but I think I went faster than I usually do on my rest runs. As I usually do, I let my body set the pace.
When I first woke up after 6-6 1/2 hours of sleep my wakeup heart rate was 53. After I had been up for about 3 hours, I took an hour nap, and when I woke from that, my heart rate was 50. This is a good example of how sleep affects heart rate.