Parkinson’s, which progressively affects the nervous system, causes mobility issues and other unpredictable symptoms that worsen over time. Now promoting his upcoming memoir Future Boy, Fox says he has learned to adapt. Speaking to The Sunday Times, he described Parkinson’s as “mysterious and enigmatic,” with no clear stages or timeline.

During the interview, Fox also addressed mortality. Having lived with Parkinson’s for decades, he admitted he’s thought deeply about death, saying he hopes to “just not wake up one day.” He added that he doesn’t want his mobility issues to make his final moments dramatic, acknowledging that while he can still walk, it has become increasingly difficult and dangerous.