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.”

“The best thing you can / do for your / marriage,” he penned. “One way to surely / get ahead, / is get rid of that / king-­size mattress, / and sleep in a / queen-­size bed.”

McConaughey delved into the reason why a smaller bed could provide a m

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