But they're more likely to get headaches and migraines when awake, researchers added

Those who are depressed sit around too much, increasing risks to themselves and their babies, research shows

Seasonal affective disorder is form of depression tied to winter's shorter days

3 years later, most had rid themselves of diabetes, high cholesterol and high blood pressure, study found

U.K. scientists find little evidence they ease symptoms

Small study suggests promise, but one expert finds the idea 'alarming'

Difference is now less than four years, down from six in 1999

Girl's Cancer Reversed After Breakthrough Gene Therapy Live Tapeworm Removed From Man's Brain Pfizer Boosts Financial Help for Patients States Must Give Poor People Access to New Hepatitis C Drugs: Federal Government New HIV Therapy Approved by FDA

Potential reasons for bad dreams

Here are some potential benefits