Elon Musk may have been 'under the influence' during an interview after his infamous tweet about taking Tesla private, WSJ reports

• Elon Musk shocked Tesla shareholders in 2018 when he announced he wanted to take the company private.

• A new WSJ report revealed that some board members were concerned that he was on drugs when tweeting.

• Musk may have been "under the influence" during an interview with the NYT after the tweet.

Tesla board members were privately concerned Elon Musk might have been on drugs when he tweeted he was considering taking the EV company private in 2018, sources familiar with the discussions told The Wall Street Journal.

Musk, who was still Tesla's chairman at the time, shocked shareholders in August 2018 when he suddenly announced on Twitter that he was "considering taking Tesla private at $420" — a number that references marijuana.

"Funding secured," he added.

Board members were caught off guard by Musk's message, The Journal reported, despite earlier reports that claimed the Tesla CEO brought up the matter to the company's board of directors a week before the tweet.

Now it appears some board members also privately expressed concerns that Musk was tweeting while on drugs and considered asking him to take a leave of absence, according to The Journal report.

In an interview with The New York Times following the tweet, Musk said that leading Tesla had been "excruciating" and that the past year had "been the most difficult and painful year" of his career.

The interview also included reporting about how Tesla's board was concerned about Musk's use of Ambien and whether it could be contributing to his late-night tweeting habits.