When I checked my wakeup HR this morning, it was 45! When I ran marathons in the early 80s, my wakeup HR was 44. Then, one day it dropped to 40 and stayed there until I quit running marathons. During the past several years, my lowest wakeup HR was 46, so this 45 is a new PB for recent years.
I told a colleague at work one day that my wakeup HR was 44. He said that was so slow that I could go out for a hamburger between beats. I'm curious to see how much lower my wakeup HR will go as my body becomes stronger. Maybe I'll be able to go out for two hamburgers :)