And we’ve have been hearing a lot more about it. Not only does America have an obesity problem, America also has a proper sleep problem. A recent study looked at people who got more or less than 8 1/2 hours of sleep. And those who got less than 8 1/2 hours of sleep a night were hungrier during the day, and lost 40 percent or more muscle mass, which is a problem. When you want to lose weight you want to keep your lean muscle mass.