The Fences star is the father of 25-year-old twins, Olivia and Malcolm Washington, and shared with ET's Denny Directo at the 2017 NAACP Image Awards on Saturday the one piece of advice he would give to the Clooneys.
"Sleep now!" Washington quipped. "Because you won't be sleeping then!"
Driving home the importance of this, he continued, "SLEEP NOW! I'm not talking to George, I'm talking to his wife. Sleep now!"
"He's gonna need support, and not from an actor," Washington, 62, added. "It's going to be a real performance. He'll see, but it's beautiful. We have twins and they're grown now, but it's a miracle."
"It's going to be a huge challenge, I mean, one baby cries, wakes the other up. It’s going to be on in that household," Damon, 46, added. "[But] he doesn't sleep a lot anyway. He'll be alright. I'm serious, he's got a hell of a work ethic."