"I have three older brothers," he said. "Our father was tough. He wasn't easy on anyone. And he wasn't easy on himself. I think the anxiety might have started there, trying to find ways to control others by trying to control myself. At the time, I never recognized that. I was just a twitchy kid."
Reynolds said he experienced anxiety before 2016's "Deadpool" began shooting, as he would stay up late working on adding new jokes into the script.
"I never, ever slept," he said. "Or I was sleeping at a perfect right angle -- just sitting straight, constantly working at the same time."