Millions of Americans will roll their clocks back one hour this weekend for the return to Standard Time. But as clocks move back and we wake on Sunday morning, after "gaining" an extra hour of the day, will Americans use that extra hour to catch up on their sleep? Probably not. According to the National Sleep Foundation's 2009 Sleep in America™ poll, two out of every ten Americans sleep less than six hours a night. Even with an extra hour, that's less than necessary for a full night's rest.