Cortisol is a hormone that plays a critical role in our body's response to stress. It is released by the adrenal glands in response to various stressors, including physical and...

It’s normal for anyone to feel a tad blue during the winter. Gloomy skies take their toll on a person’s mood, especially when you only get a few hours of...

“Brainwashing” is a term usually reserved for cults and other bad influences, not sleep. But new research indicates that your brain has the equivalent of a refreshing shower while you...