Elon Musk will not rest until Tesla hits its goals. Literally.

Tesla's CEO revealed on Wednesday night that he has been sleeping in a conference room by the manufacturing area to ensure that the company hits its lofty production targets.

"I'm personally spending an enormous amount of time on the production line," Musk said on a conference call with analysts after Tesla released its first quarter earnings results.

"My desk is at the end of the production line. I have a sleeping bag in a conference room adjacent to the production line, which I use quite frequently."

On the earnings call, Tesla affirmed its plans to vastly accelerate its production abilities and turn out 500,000 cars a year by 2018. Musk is essentially holding up his sleeping bag to all the doubters.

If this routine sounds extreme, remember that Elon Musk's superpower has always been sleep — or really the ability to go without it.

At Zip2, Musk's first startup, he was known for sleeping on a beanbag next to his desk, according to Ashlee Vance's biography of the ambitious executive.

"Almost every day, I'd come in at seven thirty or eight A.M., and he'd be asleep right there on that bag," one former colleague from that time told Vance. "Maybe he showered on the weekends, I don't know."

Musk may now be a billionaire many times over with several hugely influential companies under his belt, but some things never change.

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