I slept well last night, and my wakeup heart rate has responded and dropped to 53. However, my heart rate is still slightly irregular, though much better than yesterday morning. When I'm tired, my heart rate is slightly irregular. When I'm rested it is nice and steady. I've known for years the importance of getting proper rest, but I haven't done very well in changing my lifestyle to keep me rested. As I'm getting older, the importance of proper rest is even greater.