Supreme Court Justice Ruth Bader Ginsburg admitted that she wasn’t “100 percent sober” when she dozed off during President Barack Obama’s State of the Union this year.

“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 told an audience at George Washington University in Washington, D.C., Thursday night.

“Because before we went to the State of the Union, Justice 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,” Ginsburg said. “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!”

Ginsburg, 81, also revealed that a former colleague used to keep her alert during the president’s address.

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