Matthew McConaughey can attest that size matters—at least when it comes to beds.

After he insisted that downsizing the size of your mattress is the best thing you can do for your marriage in his new book Poems & Prayers , the Interstellar star shared insight into how getting a smaller bed has helped his and wife Camila Alves ’ relationship.

"We have kids, and we go to our friend's house and he has one of these double king-size beds put together and all the kids sleep in the bed," Matthew—dad to kids Levi , 17, Vida , 15, and Livingston , 12, with Camila—told Fox News . "The wife's on one side with her side table and the husband's on the other side and it's great when you got all three kids, but all of a sudden the kids get too big. They're out of the bed."

"I wake

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