Do you believe you get enough sleep? If you're like many of the people , you may not. Even more troubling, individuals are getting less shut-eye than they really think.

"People don't get enough sleep, and they get less sleep than they think," says Dr. Diane S. Lauderdale, a health studies expert at the University of Chicago. "As we learn more and more about the importance of sleep for health, we find evidence that people seem...

In general, most healthy adults need eight hours of sleep a night. In reality, America's adults snooze 6.9 hours each night, and 40 million suffer from sleep disorders.

No wonder many of us are cranky when we get up in the mornings!