It is 8:00 PM. You tell your partner, "I'm just going to fix this one line of code, and then I'll be right out to watch the movie." You sit down. The code is tricky, but it's an interesting puzzle. You find a rhythm. The rest of the world fades away.
Suddenly, your partner taps you on the shoulder. You jump, startled and immediately irritated. You look at the clock. It is 3:30 AM. You have not eaten dinner. You have not gone to the bathroom. You haven't taken a sip of water. The room is freezing, but you didn't notice.
To the outside world, hyperfocus looks like a superpower. "I wish I could focus like that!" they say. But for the person experiencing it, hyperfocus is a hostage situation. It is not a choice. You are not in control of the vehicle; the vehicle has hijacked you.
The ADHD brain is starved for stimulation. When it finally stumbles upon an activity that acts like an all-you-can-eat dopamine buffet, survival instincts kick in. The brain violently suppresses all other sensory information—including the biological needs of the body—to protect the fragile, precious stream of dopamine. It builds unbreakable walls around your attention. If someone tries to breach those walls, or if you try to force yourself to stop, the brain reacts with intense anger or grief, fighting desperately to remain in the tunnel.