I assume one becomes a chef because they have a love for cooking and food and the artistry involved, but I can’t think of anything more eroding to that love of the craft than the kind of working day I see chefs and other kitchen staff go through. It seems to an outsider like me that it’s basically a shift-length panic attack, every day. But that can’t be the case, or no one would do the job!
I have ADHD (actually diagnosed, in childhood) and coffee doesn’t put me to sleep, much to the contrary. A little amount wakes me properly.
There are different types of ADHD so it might be why.