Why Your ADHD Brain Runs On Caffeine

A recap from my recent live session — and the science behind the cup you’re probably holding right now.

A full room, a Q&A that ran long, and a lot of people who’ll never look at their third coffee the same way.

How many coffees have you had today? Two? Three? Sodas — three, five, honestly hard to tell? Yeah. Same. Because how am I supposed to restrict myself from the gods’ drink? Liquid happiness. The one break in the workday that actually makes sense.

That’s exactly where we started at my recent event, “Coffee & ADHD: Why Does Your Brain Run on Caffeine?” — a room full of people who’d never really questioned their relationship with caffeine, until we looked at what it’s actually doing under the hood.

Here’s what we covered.

Why it even matters

Like a lot of things, coffee can do real good when you use it well — and quietly work against you when you don’t. For ADHD brains, that line is thinner than most people realize.

It starts with dopamine. Our brains tend to regulate dopamine differently — it’s often less available in exactly the moments we need it for focus, motivation, and follow-through. So we go looking for it. Constantly. And caffeine sits right at the start of that hunt.

What caffeine is actually doing in there

Caffeine blocks adenosine — the chemical that builds up across your day and makes you progressively sleepier and foggier the longer you’re awake.

Here’s the part most people get wrong: caffeine doesn’t add dopamine to your brain. Adenosine normally acts like a brake on your dopamine signaling. By blocking adenosine, caffeine takes that brake off — so the dopamine you already have can do more. That’s the rush we’re chasing. Quick, cheap, available on every corner.

So what does that mean for ADHD specifically?

We keep hoping this little hit of dopamine — from coffee, from matcha — will finally let us function like a “normal” person. Sharp. Focused. Not running twelve mental tabs at once.

I hate to be the one to tell you: for a lot of us, caffeine doesn’t lift us above baseline. It just brings us up to it. And it can come with a tax — more anxiety, restlessness, disrupted sleep, and yes, sometimes more fatigue, not less.

One honest note, because I care about getting this right: the research here is still growing. There’s strong lived experience and some promising studies, but science hasn’t fully pinned down why caffeine hits ADHD brains the way it does. I’ll always tell you where the evidence is solid and where we’re still guessing — that’s the deal.

Wait — why would a stimulant make me more tired?

This is what researchers call the paradoxical response, and there are two leading explanations.

One: we’re just getting to baseline. Because we process dopamine differently, and caffeine nudges us toward baseline rather than past it, some of us feel calmer — which can read as sleepier. It’s loosely similar to how ADHD stimulant medication can have a settling effect. (Still a theory, not confirmed in humans — but an interesting one.)

Two: adenosine rebound. While caffeine is busy blocking those receptors, adenosine keeps quietly piling up in the background. When the caffeine wears off, all of it lands at once — and that crash brings the fatigue, the energy drop, and the wandering focus.

Okay — if not caffeine, then what?

Great question. And the honest answer is: there’s a lot. There are researched, proven ways to help your brain focus, settle, and hold energy without the crash — and that’s exactly what we work through together at my events.

I don’t hand out generic productivity tips. I share coping mechanisms grounded in research and built for how our brains actually work, so you can feel better and get through a normal day without white-knuckling it.

Coming up next: “Why Your ADHD Brain Will Land You in Jail.” Yes, really. You’re going to want to hear this one.

📩 Want the date, location, and registration link? Subscribe to my newsletter and I’ll send you everything first.

And if you lead a team or organize events: I bring these sessions to companies and conferences, too. If your people are smart, driven, and quietly running on caffeine and willpower — let’s talk. This is exactly the kind of conversation that lands in a room.