Nine years ago, a sleep-deprived Arianna Huffington was so exhausted that she collapsed in her office and broke her cheekbone.
The experience led Huffington, the president and editor-in-chief of The Huffington Post Media Group, to completely change her own habits and advocate for others to do the same.
In her new book, "The Sleep Revolution," she argues that getting enough sleep — about seven to nine hours a night — helps you lead a more productive life.
"Once we get all the sleep we need, everything else is better," Huffington told CNBC in a recent interview. "We are better at our jobs, at building a business. Our health is better. Our happiness is better."