After I quit my nightly Wine habit my HR dropped from 60 to 45 and HRV went up on average, I am in the top percentage for my age group. I take 6mg weekly of Rapa no noticeable difference in HR or HRV it was bc I stopped the Wine in addition no food 3 hours before bed.
Water-only fasting for me plummets my sleeping HR. At least 5bpm lower at 24h, and 10bpm lower at 48h.
And any alcohol whatsoever makes my sleeping HR significantly higher and my sleep quality so much worse. It’s one reason I pretty much stopped taking in any alcohol whatsoever, because it just ruins my sleep.
I’ve been measuring sleeping heart rates for more than 10 years now, and those two things are always true for me, without fail.