I have wildly varying reactions to caffeine for no obvious reason

I assume this is normal for people with ADHD, but thought it was worth discussing. Some days I have caffeine and it seems to do Nothing, besides quiet my thoughts a little. Other times I have caffeine and I'm all over the place and can't seem to stick to any one single task. Like yesterday I had my Vyvanse and a big cup of coffee because I was sleepy and I was so normal and on top of things, but today I've had my Vyvanse and an energy drink and I'm doing a terrible job of sticking to the task at hand, such as making this post right now lmao. The obvious variable is the coffee vs energy drink, but sometimes I can't focus with coffee and sometimes I'm very stable with energy drinks. I imagine it's a combination of the amount of sleep I get, the amount of caffeine I have, maybe the time of day I have it, maybe what I do or don't eat with it, etc. I mostly wanted to bring it up because I know the stereotype is that caffeine does nearly nothing for us as far as energizing and waking us up, but sometimes it definitely be doing something to me lol.