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Big sister Venus yelled from her box to move her feet and get her energy back.

“I think either I got too confident or too relaxed,” Serena said. “I stopped moving my feet. My energy was low. It was strange for a final for me to play so lackadaisical. It wasn’t me. Then I started making errors.”

Williams celebrated until 3 a.m. Monday, then set her alarm for 5:15. She took a cat nap in the green room at “CBS This Morning” while movie director James Cameron was talking.

Williams is now three Grand Slam titles from tying Martina Navratilova and Chris Evert at No. 4 on the all-time list. Told that Navratilova joked on Twitter “you are catching me and Chris, and I don’t like it,” Williams giddily said she’d retweet it.

Coach Patrick Mouratoglou, who has been working with Williams since her first-round loss at the French Open, has told her she should stop ignoring records.

“Since I plan on playing for a long time, definitely plausible,” Williams said of catching those greats. “I have to make sure I stay healthy and stay positive and stay calm.

“And if I never won another Grand Slam, I’ve had a fabulous career, a historic career.”