New studies in the United States may explain why some people can function on just a few hours of sleep per night.

London scientists have determined a possibility that menstrual periods may be linked to ovarian cancer in women.

Treating teenage depression seems to be fairly effective, at first, but nearly 50 percent of those suffering from depression eventually become depressed again.

Patients requiring a new kidney appear to be much more likely to receive a kidney now than if they were waiting for a transplant more than 10 years ago.