Paul Dano Says He Couldn't Sleep While Playing 'Terrifying' Riddler in 'The Batman'

Paul Dano is opening up about his transformation into the Riddler for The Batman.

In a new interview, the 37-year-old actor admitted that he had a hard time sleeping while filming the upcoming movie because he couldn’t shake his serial killer character.

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“There were some nights around that I probably didn’t sleep as well as I would’ve wanted to just because it was a little hard to come down from this character,” Paul shared with Entertainment Weekly. “It takes a lot of energy to get there. And so you almost have to sustain it once you’re there because going up and down is kind of hard.”

He added, “What I felt was the opportunity that [director] Matt [Reeves] was giving with a villain in this film was more real, potentially more terrifying.”

Paul then talked about the crazy lengths he went to getting into character, opening up about wrapping himself up in plastic wrap, since the Riddler didn’t want to leave behind DNA at crime scenes.

“My head was just throbbing with heat,” Paul said of taking off his costume. “I went home that night, after the first full day in that, and I almost couldn’t sleep because I was scared of what was happening to my head. It was like compressed from the sweat and the heat and the lack of oxygen. It was a crazy feeling.”

The Batman – which also stars Robert Pattinson, Zoe Kravitz, and Colin Farrell – will be out in theaters on March 4. Check out the latest trailer here!