New circadian depression subtype discovered by Australian scientists

7News Just In · Oct 21, 2026 · 3m

Australian researchers from the University of Sydney have identified a new subtype of depression called circadian depression, which affects approximately one in four people with depression. This form of depression is linked to disruptions in the body's 24-hour internal clock and presents with distinct symptoms including oversleeping, weight gain, and seasonal mood changes. Unlike typical depression, circadian depression does not respond well to conventional antidepressant treatments but can be managed through targeted interventions including morning light exposure, daytime activity, and…