After the birth of his daughter and a hectic year of studying for the California bar exam, Mark Yanis let exercise and nutrition fall by the wayside. Soon he had gained about 20 pounds, always felt run-down, and was having trouble sleeping through the night.
On top of this, people who don't sleep well are at a higher risk of becoming obese. In 2004 a Stanford University and University of Wisconsin study found that sleep-deprived people had higher levels of a hormone that triggers appetite and lower levels of a hormone that suppresses it.
Matt Hanover, 44, has struggled with both weight and sleep problems since adolescence. "I spent every day feeling like I'd been hit by a truck," says the digital media producer in Santa Monica, Calif. "I was too tired to walk up a flight of stairs or around the block."