Seasonal affective disorder
From Wikipedia, the free encyclopedia
Seasonal affective disorder (SAD), also known as winter depression, is a mood disorder whose sufferers experience normal mental health throughout most of the year, but experience depressive symptoms in the winter or, less frequently, in the summer, repeatedly, year after year. As stated by the U.S. National Library of Medicine:
"Some people experience a serious mood change when the seasons change. They may sleep too much, have little energy, and crave sweets and starchy foods. They may also feel depressed. Though symptoms can be severe, they usually clear up."
The condition in the summer is often referred to as Reverse Seasonal Affective Disorder, and can also include heightened anxiety.