[jp57]

I think this is a good context to remind people that there isn't One True Way™ when it comes to our bodies, metabolisms, brains, etc.

I quite believe that for many people using a lot of caffeine increases their anxiety and reduces their ability to function. I'm not one of those people. I use quite a lot of caffeine and have very little anxiety and no trouble sleeping. I am, if anything, anti-anxious. I suspect my personality type would make a great fighter pilot or air-traffic controller. (I myself would probably be bad at both those jobs, but not because of the anxiety.)

So I'd say IF you have chronic anxiety problems or you are having sleep problems, and you use a lot of caffeine, it's probably worth quitting or cutting down the caffeine to see if that helps.