Zeo Personal Sleep Monitor

Twenty percent of Americans sleep less than six hours a night, and nearly one-third have lost sleep worrying about financial concerns, according to the National Sleep Foundation, which recommends that adults get seven to nine hours. "Our society thinks sleep is for slackers," says Darrel Drobnich, the organization's chief program officer.

But all that lost sleep is taking an insidious toll. Chronic, inadequate sleep raises the risk of cardiovascular disease, depression, diabetes and obesity.