Seriously - I was drinking far too much coffee during lockdown and have switched 2 days ago to decaf. Too early to tell, but it feels like less triggering of hyperness...
I used to drink decaf, but I just missed the taste of an actual Arabica specialty coffee. Because the decaffeination process removes more than just the caffeine, even specialty decaf is not as good.
So through the day it goes: full (morning), low caff (mix) (afternoon), decaf (evening).
No need for it to be either/or.
fwiw
For some reason, when I worked from home, I was getting a headache in the afternoon. All the time. Then one day I only got a chance to get my first cup of coffee. On that day, no headache. So upon further testing it turned out that I can only drink one regular cup when working from home. But on weekends or working from the office, this is not an issue. Only working from home.
Over time, decrease the caf and increase the decaf.
Anyhow, as I recall (and I could be wrong), you actually want to start low and end high. Obviously decaf in the evening may still be good though, given you want to be able to sleep without detriment.