I never found caffeine to affect my PN, but switched to decaf coffee and tea some years ago because I have heard and/or read from reliable sources that it is not good for us. Does it make sense that it is ok to be addicted to a drug? I know there is caffeine in decaf coffee and tea, but vastly less than the regular stuff. I never found much, if any, benefit from caffeine anyway. If you need it to wake up then you are not getting enough quality sleep.
Ron