HealthDay (2/23, Murez) reports a variable sleep schedule may worsen mood and symptoms of depression, investigators concluded after using “fitness trackers to determine the sleep and activity of more than 2,100 early-career physicians,” then gathering “mood data by asking the interns to report their daily mood on a smartphone app and to take quarterly tests for signs of depression.” The findings were published online Feb. 18 in the journal npj Digital Medicine. (SOURCE: APA Headlines)