seasonal affective disorder

I must be getting old because I don't know who some of these young whippersnappers are anymore. Apparently, a Canadian singer named Grimes (who happens to be dating Elon Musk) is somebody I need to pay attention to. And as is often the case with celebrities, it's not for a good reason. 
Seasonal Affective Disorder has had its validity questioned as a distinct mental disorder. Research published in journal Clinical Psychological Science provides persuasive data that casts major doubt on SAD being a legitimate psychiatric disorder.
Seasonal affective disorder (SAD) is a type of depression related to changes in seasons. Most people with SAD experience symptoms that start in the fall and continue throughout the winter months, then fade away as spring begins. Symptoms of major depression that may be part of