Elon Musk turned some office space at Twitter's San Francisco headquarters into sleeping quarters.
It followed his "hardcore" ultimatum, asking employees to commit to "long hours at high intensity."
Elon Musk has turned some office space in Twitter's San Francisco headquarters into bedrooms and is reportedly having one made for himself as well.

That has attracted the attention of the San Francisco Department of Building Inspection, which told Insider it was investigating the reports.
Musk was not impressed, tweeting on Wednesday: "So city of SF attacks companies providing beds for tired employees instead of making sure kids are safe from fentanyl. Where are your priorities @LondonBreed!?"
His decision to have some employees sleep at the office comes after one worker tweeted a picture of his boss in a sleeping bag and mask on Twitter's office floor on November 2, shortly after Musk took control.
In an email sent to staff on Wednesday, Musk told employees they must start coming into the company's headquarters, advising them that other Bay Area offices would not be used "for now."
Insider obtained a copy of the email via a Twitter employee who wanted to remain anonymous but whose identity has been verified by Insider.
Take a look inside the office space that's been turned into bedrooms.
Elon Musk has turned some of Twitter's office space in its San Francisco headquarters into bedrooms.
Two people familiar with the matter confirmed the news to Insider. Forbes also reported the news on Monday, citing sources.
Twitter employees on Monday discovered some offices and conference rooms in the company's headquarters had bare mattresses and curtains inside, two anonymous people with knowledge of the matter told Forbes. One room also featured a plant, they added.
Forbes obtained a photo from a source showing one of the converted bedrooms. The photo appeared to show a queen size bed, a wooden bedside table, a table lamp, two armchairs, and bright orange carpet inside the room, according to Forbes.
It was unclear how many bedrooms there were in total, the publication reported, but one person with knowledge of the matter said there could be between four and eight bedrooms per floor. The person added the rooms looked "comfortable."
A few of the bedrooms were located on a floor that was mainly unused, another source familiar with the situation told Forbes. A trash can in one of the office bedrooms already had waste inside, indicating that an employee had used the amenities, the source added.
Patrick Hannan, communications director for the San Francisco Department of Building Inspection, subsequently confirmed the investigation to Insider on Wednesday. Hannan said the department had received a compaint about Twitter's new furnishings on Tuesday morning through San Francisco's 311 system, a hotline for non-emergency municipal queries and concerns.
"We investigate all complaints. We need to make sure the building is being used as intended," Hannan told Insider by email. "There are different building code requirements for residential buildings, including those being used for short-term stays. These codes make sure people are using spaces safely. Everyone in San Francisco deserves a safe place to live, work, play and sleep and no one is above the law."
As of Wednesday afternoon, Hannan noted that the Department of Building Inspection was already reaching out to Twitter's building representatives to conduct a site inspection and would be commencing an investigation within 72 hours.
"If we find suite 900 no longer meets the building code, we'll issue a notice of violation, which will be posted to our website and at the site, just like all notices of violation," Hannan said.
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