Sarah Stanley Fallaw, director of research for the Affluent Market Institute, studied more than 600 millionaires for her book, "The Next Millionaire Next Door: Enduring Strategies for Building Wealth."
She found that how millionaires occupy their minds and time can influence how much wealth they build.
Source: "The Next Millionaire Next Door"
"Successful individuals are keenly aware of how they spend their resources, including their emotional and cognitive resources," Stanley Fallaw wrote.
Source: "The Next Millionaire Next Door"
She found that millionaires spend their time differently from the average American in five areas: reading, exercising, perusing social media, sleeping, and working.
Source: "The Next Millionaire Next Door"
Millionaires spend roughly 5 1/2 hours a week reading for pleasure, compared to the average American's two hours.
Source: "The Next Millionaire Next Door"
Consider celebrity Melissa McCarthy, who begins her morning reading The Los Angeles Times, National Geographic, and The New York Times.
Source: The New York Times via Business Insider
Even billionaires spend a lot of time reading. Bill Gates is an avid reader and has quite the book collection.
Source: Business Insider
And investor Warren Buffett, who spends 80% of his days reading, has said he has a "disgusting pile" of books by his chair.
Source: Business Insider, CNBC
In 2015, Mark Zuckerberg vowed to read one book every other week "with an emphasis on learning about different cultures, beliefs, histories and technologies," he wrote in a Facebook post.
Source: Business Insider
Businessman and investor Mark Cuban often reads for three hours a day to learn more about the industries he's working in.
Source: Business Insider
But reading isn't the only hobby among the rich. Millionaires also spend more time exercising — nearly six hours a week compared to the average American's weekly 2 1/2 hours, Stanley Fallaw found.
Source: "The Next Millionaire Next Door"
Apple CEO Tim Cook wakes up around 4:30 a.m. or 5 a.m. every day to get to the gym.
Source: The Wall Street Journal via Business Insider
Vogue's editor-in-chief Anna Wintour also rises early to get her exercise in, waking up every morning at 5:45 a.m. to play tennis.
Source: Business Insider
Billionaire Richard Branson also exercises before breakfast and is a fan of playing tennis. He stays active by kite-surfing, swimming, and cycling.
Source: Business Insider, Virgin, Business Insider
Oprah Winfrey's workouts include "45 minutes of cardio six mornings a week, four to five strength-training sessions a week, incline crunches, and stretching," according to her trainer.
Source: O Magazine via Business Insider
And actor Mark Wahlberg is an overachiever; he works out twice a day, from 3:40 a.m. to 5:15 a.m. and at 4 p.m.
Source: Business Insider
Millionaires may have more time to exercise because they spend less time on social media. The average American spends 14 hours a week on social media compared to the average millionaires' 2 1/2 hours a week.
Source: "The Next Millionaire Next Door"
Model and Kode with Klossie founder Karlie Kloss takes a weekly digital detox. "I will totally shut off and not post Instagrams or answer my emails," she told the Mirror.
Source: The Mirror via Business Insider
McCarthy also takes digital detoxes, putting her phone away and disconnecting from technology on weekends.
Source: The New York Times via Business Insider
Some don't have social media at all. Jennifer Lawrence previously told BBC Radio 1 that social media baffles her. She said she "will never get Twitter."
Source: BBC via Business Insider
George Clooney has vocally opposed Facebook and Twitter. "I'd rather have a rectal examination on live TV by a fellow with cold hands than have a Facebook page," he once said.
Source: Business Insider
But millionaires make a few sacrifices to make the most of their time — they sleep nearly eight hours less a week than the average American.
Source: "The Next Millionaire Next Door"
Tesla CEO Elon Musk typically crashes around 1 a.m. and wakes up at 7 a.m., averaging six hours of sleep — less than the recommended seven to eight hours.
Source: Business Insider
Meanwhile, PepsiCo chairwoman Indra Nooyi wakes up as early as 4 a.m. She told Fortune, "they say sleep is a gift that God gives you ... that's one gift I was never given."
Source: Fortune via Business Insider
Fashion designer Tom Ford attributes his success not to talent, but to his energy — he's awake 21 hours a day, only getting three hours of sleep a night.
Source: Business Insider
But he's not the only one — Martha Stewart is so busy running her business that she reportedly gets less than four hours of sleep a night.
Source: CNN Money via Business Insider
Likewise, life coach Tony Robbins typically gets about three to five hours of sleep.
Source: Business Insider
That's probably because he's busy working 16-hour work days, sometimes to the point of exhaustion.
Source: Business Insider
Robbins' work hustle exemplifies another trait common among millionaires. They often work more than the average American — a difference of six hours a week.
Source: "The Next Millionaire Next Door"
Former GE CEO Jeff Immelt has said he worked 100-hour weeks 24 years in a row.
Source: Business Insider
And Musk is known for his tireless work ethic and puts in 80- to 100-hour work weeks.
Source: Business Insider
While Facebook COO Sheryl Sandberg leaves work at 5:30 p.m. to have dinner with her kids, she gets back to work online after putting them to bed.
Source: Business Insider
And former Yahoo CEO Marissa Meyer used to put in 130-hour weeks while working at Google, which she managed by sleeping under her desk.
Source: Business Insider
