Elon Musk reveals how much sleep he gets each night

Elon Musk is one of the most accomplished tech leaders in the world. You'd think this guy never sleeps. But it turns out, he does in fact sleep!

In a Reddit AMA from 2015, the Tesla Motors and SpaceX CEO said he sleeps "almost exactly 6 hours on average."

That's slightly below the average amount of daily sleep advised by the National Sleep Foundation, which recommends that adults over 18 get seven to nine hours of sleep each night to maintain a healthy weight and mood and to improve one's memory and athletic performance.

RELATED: See what some of the biggest business leaders looked like in high school:

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What famous business leaders looked like in high school
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What famous business leaders looked like in high school
Mark Cuban

Mark Cuban may have ditched his wild 'do, but otherwise, he hasn't aged a day since he took his senior portrait in 1976!

(Classmates.com/Reuters)

Barbara Corcoran

"Shark Tank" star and real estate magnate Barbara Corcoran was a cheerleader in her heyday -- and she hasn't lost any of pep since 1969.

(Classmates.com/Getty)

Barbara Corcoran

We weren't kidding!

(Classmates.com/Getty)

Barbara Corcoran
(Classmates.com/Getty)
Warren Buffett

The business magnate was quite the dapper young man in 1947.

(Classmates.com/Getty)

Steve Wozniak

These days, the Apple co-founder opts for more casual looks than his tux in his 1968 senior portrait.

(Classmates.com/Getty)

Steve Jobs

Wozniak's business partner, Steve Jobs, rocked the man-bob in 1972.

(Classmates.com/Reuters)

Ralph Lauren

Ralph Lauren had the same penchant for plaid suits in 1957!

(Classmates.com/Reuters)

Paul Allen

Microsoft co-founder Paul Allen looked totally current with his Warby Parker-esque frames in 1969.

(Classmates.com/Getty)

Bill Gates

Plaid shirt? Check. V-neck sweater? Double-check. Bill Gates' style sure hasn't changed since the 8th grade in 1969.

(Classmates.com/AP)

Paul Allen and Bill Gates

Adorable! Allen and Gates have taken their friendship from the computer lab to the basketball court.

(Classmates.com/Getty)

Oprah Winfrey

Before Oprah was one of the biggest TV personalities and businesswomen in the world, she was voted "Most Popular" in her 1971 high school yearbook.

(Classmates.com/AP)

Oprah Winfrey

Love those peace sign earrings!

(Classmates.com/PA)

Michael Bloomberg

No doubt 1960 Debate Club helped prepare Michael Bloomberg for a future in business and politics!

(Classmates.com/AP)

Michael Bloomberg

Just take a look at those determined eyes ...

(Classmates.com/AP)

Marissa Mayer

These days, Yahoo CEO Marissa Mayer speaks sans notecards. Here she is at her 1993 homecoming dance.

(Classmates.com/Getty)

Marissa Mayer

The only thing that's changed since this 1993 debate is Mayer's hair -- the CEO went from a wavy brunette to a straight blonde bob!

(Classmates.com/Getty)

Donald Trump

Trump's soccer days are behind him -- but his competitive spirit lives on.

(Classmates.com/Reuters)

Donald Trump

He even had a bit of the same combover in 1964!

(Classmates.com/AP)

Marcus Lemonis

"The Profit" star Marcus Lemonis, chairman and CEO of Camping World and Good Sam Enterprises, rocked a 'fro in 1988.

(Classmates.com/AP)

Abi Heller

We wonder what Classmates.com and Intelius CEO Abi Heller's former schoolmates think of his biz!

(Classmates.com)

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It's surprising the 45-year-old entrepreneur even manages six hours, considering he splits most of his days between his ambitious aerospace and automotive companies; he is also a major philanthropist and the chairman of the green-energy service company Solar City, and he sits on several advisory and engineering boards. For what it's worth, Musk has said that he's slept in Tesla's factories — even keeping a sleeping bag in a conference room next to where the manufacturing is done so he can better inspect vehicles as they come off the production line.

If you're wondering how Musk can accomplish as much as he does on little sleep, there are plenty of known ways to function at optimal levels on just four hours of sleep. Business Insider even has a step-by-step guide (with charts!) to help gradually reduce your sleeping hours while also getting more out of your waking hours.

See Also:
Elon Musk Is Trying Something Tuesday That Could Forever Change Spaceflight
Science Says You're Waking Up Too Early For Work
Elon Musk Uses This Ancient Critical-Thinking Strategy To Outsmart Everybody Else

SEE ALSO: After weeks of bugging him on Twitter, Elon Musk finally told me his 'dark secret'

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