Supreme Court Justice Ruth Bader Ginsburg says she nodded off during President Obama’s State of the Union address because she enjoyed some fine wine before the event and was not “100 percent sober.”

“The audience for the most part is awake, because they’re bobbing up and down, and we sit there, stone-faced, sober judges. But we’re not, at least I wasn’t, 100 percent sober,” Ginsburg said during a talk Thursday night at George Washington University in Washington, DC, The Blaze reported.

Ginsburg, 81, said she had wine with dinner before the speech — and its effects were evident as she was captured on TV catnapping as the president addressed the nation last month.

“Because before we went to the State of the Union, Justice (Anthony) Kennedy brought in … it was an Opus something or other, very fine California wine, and I vowed this year, just sparkling water, stay away from the wine, but in the end, the dinner was so delicious, it needed wine,” she confided, drawing laughter from the sold-out university audience.

“So I got a call when I came home from one of my granddaughters and she said, ‘Bubbe, you were sleeping at the State of the Union!’”

The liberal justice is no first-time offender — having slept through the president’s annual address before.

In 2013, she also blamed Kennedy for boozing her up with a “very good California wine” that sent her into a gentle nap.

Ginsburg said she misses former Justice David Souter, who retired in 2009, because he always had her back — and side.

“David Souter, when he was on the court, he was on one side and he had an acute sense of when I was about to [nod off],” Ginsburg recalled.

“Now I have Justice Kennedy on one side, Justice (Stephen) Breyer — and they’re sort of timid about it.”