Originally appeared on E! Online

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

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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.

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"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," McConaughey — dad to kids Levi , 17, Vida , 15, and Livingston, 12, with Camila — told Fox News . "The wife's on one side with her side

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