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Woman in Gold star Ryan Reynolds is opening up about the “crazy experience” of fatherhood.

The Voices actor, 38, who welcomed daughter James with Gossip Girl star wife Blake Lively in late December, says he’s “totally” in zombie mode all the time due to the sleep deprivation.

“There have been times where I woke up, literally had no idea I had been walking for five minutes,” Reynolds tells E! News.

That said, the actor is loving every minute of fatherhood.

“But you love it,” he gushes. “You wake up in the middle of the night, you got a big stupid smile on your face. I was telling someone else that. Anything else that woke you up every 45 minutes, you’d kill it. But when it’s a baby, it’s the best thing that ever happened to you.”

He adds: “Right now the baby’s training us so I think we gotta turn the tables on this one.”

The Canadian native went on to gush about his lovely wife.

“When that happens you fall so much more in love with your partner,” he shares. “It’s a pretty crazy experience. What blows my mind is that it’s so common yet it’s so profound at the same time. Something so many people do.”

Speaking of James’ birth, Reynolds’ character in Woman in Gold misses his child’s birth due to a court case he’s working on.

“I know Randy was committed to this cause, missing his child’s birth. You would need wild horses and several bulldozers to pull me away from that. I could not miss that,” Reynolds says.