My fiancé has combined type nominally, but other than racing thoughts and some stimming, he’s definitely the quiet type. I would say that’s probably the case for many (most even?) AuDHD people, as autism doesn’t usually go hand in hand with the endless social battery that the ADHD stereotype portrays.
That’s quite frequent. My Not-a-doctor, simplified understanding is:
Caffeine doesn’t target processes related to dopamine but it’s a stimulant. Outside of hyperfocus mode, ADHD brains are constantly understimulated because the lack of dopamine makes things not feel engaging and interesting. This is why our thoughts race, our brain is struggling to find ALL THE THINGS (thoughts, hobbies, worries, plans, memories) that might give it the stimulation it needs.
Since coffee is a stimulant, the brain gets what it’s looking for and doesn’t need to race through all the possible thoughts, it’s happy. The two main problems are: