One glance at U.S. coffee sales will give you a sense of America's sleep habits. and have continued to thrive in the first half of 2012. Americans, more than ever before, apparently are sleep ...

How did we come to associate sleeping and snoring with the letter ‘Z’? The origins trace back farther than you might think but are tied to early 20th-century American comic strips.

The ABC's of Zzz's: How Sleep Affects You and Your Health By CBSNews.com staff CBSNews.com staff January 31, 2002 / 8:43 AM EST / CBS ...