I have noticed something.

I try to have a day of rest once a week.

Coffee evidently interferes with any rest, not just sleep. If I drink any of it on a day reserved for rest from mental/physical/emotional demands, I feel like I have worked for weeks on end without rest and lost momentum, I do not feel stronger or recovered the next day. Beyond tired. Worn out.

If it’s not a day of rest from something, caffeine is generally beneficial for me.

Does anyone else other than me skip caffeine once or twice a week?

No, I thrive on caffeine, I even buy caffeine gum sold on Amazon, great stuff, and there is caffeine in my creatine drink pre workout, my pre workout is ;
Coffee
Creatine with caffeine which I drink during workout
Caffeine gum 1-3 pieces
YAHOO! Oh and I smoke a little pot also so I can really get into my weightlifting and motivate myself to lifting heavier........

It would throw my body into shock, so I'm thinking it would be the opposite of a restful day.

I have noticed something.

I try to do something at least once a week.

During that time caffine helps a lot.

24 hours without caffeine?
I'd be stabbin' somebody in the neck
with a #2 pencil.