Sydney researchers find a "body clock" type of depression

The study of 11,380 Australians found about 23 per cent had this type. People in this group reported less benefit from common antidepressants.

Confirmed

Researchers in Sydney say they have found a type of depression linked to the body clock. They call it "circadian depression". The body clock, or circadian rhythm, controls when we sleep and wake. The University of Sydney study used clinical and genetic data from 11,380 Australians. About 23 per cent fitted this type, The Guardian reported. The study was published in the British Journal of Psychiatry. People in this group reported less benefit and more side effects from common antidepressants. "What is critical about being in this circadian type is its poor response to the standard therapies," Professor Ian Hickie said. The researchers suggest looking at treatments that target body rhythms, such as light therapy. Professor Andrew Coogan, an expert not involved in the study, urged caution. He said the results are "initial if interesting findings that warrant further examination". The study only included people of European background. It is not yet known if the results apply to everyone. Do not stop or change medicine without talking to your GP. If you need support, call Lifeline on 13 11 14.