The 44-year-old, who plays a Frenchman Jean Valjean in the movie adaptation of Victor Hugo's classic novel, said he went without talking for days for the role.
"There's no coffee, there's no dairy. There's eight hours sleep. I drink hot water with lemon all day long. I would go on vocal rest some days where I wouldn't speak at all," he said.
The actor's family really wanted the shooting to get over because he would stay silent for days.
"I think my family can't wait till I have finished this job because it's like 'Who is this monk who is living with us who's going through some kind of vow of silence?," Jackman added.
Directed by Tom Hooper "Les Miserables", also features Russell Crowe, Anne Hathaway and Amanda Seyfried.
