It's cold.
For more than a week, a remarkable chill has overtaken the Midwest and Northeast. Sub-freezing temperatures, stretching north from New England all the way south to Amarillo, Texas, are expected to stick around for the foreseeable future. In New York City, temperatures have been below freezing for 11 days, and they're not expected to rise above 32 degrees until Sunday. And while this year's weather is not breaking any records, it sharply contrasts with the series of mild winters of previous years.
Aside from chilling bones, the cold can also dampen spirits. In their most acute form, the winter blues are called Seasonal Affective Disorder (SAD), a form of depression linked with the time of year. Four to six percent of people suffer from the disorder, and their symptoms can vary, but most experience a loss of energy, feelings of sadness and hopelessness and a desire for isolation. Researchers have not yet pinned down the causes of SAD, but sunlight—or more specifically, the lack thereof—is believed to be the most likely culprit.
