Trying to describe what it feels like to have ADHD to a neurotypical person is like trying to describe what chocolate tastes like to someone with no tongue, says Jeremiah Hartmann.

He knows the feeling well, but it wasn't until his late twenties that he had a name for it.

Jeremiah Hartmann overcame the challenges of ADHD and uses it to advantage. Credit:Wolter Peeters

He didn't know why he couldn't sit still in class, or why he could command incredible focus one day only to be overwhelmed or lost in a daze the next.

"I had so many accidents," Mr Hartmann said. "So many hospital visits, mostly from BMX falls. I put my hand through a window and had to have plastic surgery … I went through year 12 in a hand cast."