December 04, 2012 05:00 PM

Paul Zimmerman/WireImage

No amount of tears, tantrums or extreme tiredness can deter new dad Josh Lucas from reveling in his most important role.

“Everyone says it’s the greatest adventure you’ll ever have and I’m amazed at how much I’m loving it,” the actor told PEOPLE during MoMA‘s benefit honoring Quentin Tarantino on Monday in New York City.

Recently, Lucas and his wife Jessica Henriquez set out to sleep train 5-month-old Noah Rev — and not even a week of wailing could affect his mood.

“It was incredibly difficult. The child is enraged and hates you,” the first-time father admits. “And yet you’re totally sleep-deprived and amazed by the experience — even when he’s screaming — of what you’re going through.”

Calling fatherhood a “beautiful thing,” Lucas has been busy bonding with his baby boy, including taking his son to see Wreck-It Ralph, Noah’s first movie theater experience.

“I took him to a Tiny Tots screening, which is where you’re allowed to bring your baby,” Lucas, 41, shares.

“He sat there with his mouth wide open. He literally watched 15 minutes with his mouth agape and then passed out like he’d been shot.”

— Anya Leon with reporting by Michelle Ward

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