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Don't sleep on Matthew McConaughey's biggest relationship secret.

The Academy Award-winning actor, who has been married to wife Camila Alves for 13 years, has a simple recipe for maintaining a healthy marriage.

McConaughey, 55, put pen to paper and offered a few of his life lessons in his new book, "Poems & Prayers." He told Fox News Digital that one small change in his household helped him further connect with the lady in his life.

In an excerpt from his new book , McConaughey encouraged couples to downsize their mattress to "get ahead."

MATTHEW MCCONAUGHEY LOST OUT ON ‘TITANIC’ LEAD ROLE AFTER REFUSING DIRECTOR'S REQUEST: BOOK

"The best thing you can / do for your / marriage," he penned. "One way to surely / get a

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