Sleep Habits Vary by Ethnicity
Sleep problems and sleep habits vary among different ethnic groups, according to a new national survey. But among all ethnicities, there remains a common denominator: Many of us simply don't get enough sleep.

Low Vitamin D Levels Linked to Asthma
Many children with asthma have low blood levels of vitamin D -- and the insufficiency seems to place them at risk for more severe disease, a study shows.