I stopped drinking and my BP is now completely normal, and RHR is low 40's. Sleep is much better too.
It's a combination of genetics and athletics.
Edit: my smartwatch readings include sleep. Sitting upright at a table right now it's around 65
Nurse: “it goes off if your HR is too low.”
Me: “what’s it set to?”
Nurse: “39 BPM”
Me: “ yeah, you’re going to want to turn that down a few notches.”
Genetics play a role, too. Back in the day, one of the fastest road bike racers in WA state told me he’d never seen his resting HR below 60.
Being sober is pretty stressful
Something I realized was that alcohol was actually causing my anxiety and depression, which was one of several things that led me to quitting. I paid compound interest on the short term relief.