You sleep 10-12 hours, wake up exhausted and come alive only in the evening - scientists have linked this with a new subtype of depression at the University of Sydney, such symptoms were found in almost a quarter of study participants. The condition is called "circadian depression" and is related to a malfunction in the biological clock. It has not yet been recognized as a separate diagnosis.

You sleep 10-12 hours, wake up exhausted and come alive only in the evening - scientists have linked this with a new subtype of depression at the University of Sydney, such symptoms were found in almost a quarter of study participants. The condition is called "circadian depression" and is related to a malfunction in the biological clock. It has not yet been recognized as a separate diagnosis.