My wakeup heart rate is going down

My wakeup heart rate was 58 this morning, after a good 7 hours sleep. It was 63 or 64 last week. If I continue getting good sleep, my heart rate should continue going down. I'm leaving in about an hour to go running so I get my running in early. I'll be working in my yard for most of the day, mowing lawns and trimming trees, and if I don't get my running in now, I probably won't get it done at all.