To make matters worse, the 78-year-old Biden had warned U.S. military service members just this past summer that top Pentagon officials consider climate change to be the "greatest threat" to America's national security. So when Biden was on video catching some Zs, reporters took notice.

It was soon shared across social media.

"Biden appears to fall asleep during COP26 opening speeches," tweeted Zach Purser Brown (@zachjourno), who covers politics for The Washington Post.

By Monday afternoon, the post was retweeted nearly 5,000 times and had some 17,000 likes. The Telegraph newspaper also posted the video to YouTube, where it was seen more than 25,000 times.