ORANGE, Calif.—Twenty years ago, Israel Zuniga, 39, was asleep in bed when he experienced an event that would change his life forever: his first seizure. “I was sleeping one night and when I woke up, I was on my bedroom floor surrounded by paramedics,” Zuniga said. “My brother was sleeping next to me. He was the one who realized something was wrong. … We didn’t know what was happening.” Zuniga was taken to the hospital, where doctors diagnosed him with epilepsy, a medical condition caused by unusual electrical activity in the brain that often results in seizures. Over the next two decades, Zuniga experienced one to three seizures per day, he said. They arrived unexpectedly, often with little warning while he was at work, and he was under constant medical care. “I was a prisoner to the disease. I depended on so many people. I always had the fear of …