The 44-year-old "Prisoners" star, who has been following a diet created by David Zinczenko, said that his diet has left him with low energy, reported Daily Telegraph.
"I'm just off the 8-Hour Diet from Dave Zinczenko of Men's Fitness. Water dehydration got me that ripped look. I'm so low energy I'm literally sleeping all the time because I'm on a zero-carbs, limited-calories diet," Jackman said.
The actor, who is married to Deborra-Lee Furness, cannot stay still in his sleep.