Gretchen Rubin, the New York Times bestselling author and podcast host, joins "CBS This Morning" co-host Norah O'Donnell. Rubin, who uses science, pop culture and personal experiences to explore how we can make our lives happier, offers practical advice for people looking for happiness. She shares what value sleep, exercise and eating healthy have on personal happiness. Her upcoming book called "Outer Order, Inner Calm: Declutter and Organize to Make More Room for Happiness" is set to be released in March.