A study published in the British Journal of Psychiatry proposes that disrupted body-clock rhythms may help distinguish a subgroup of depression. The researchers analyzed clinical and genetic data from more than 10,000 Australians with depression and classified about 23% as having features associated with this proposed subtype.
What the study found
The researchers considered factors including sleep-wake patterns, social jet lag, morning tiredness and daytime sleepiness. People in the group were more likely to report disrupted sleep, low daytime activity and low energy. The findings also suggested they may respond less well to standard antidepressant treatment, though further research is needed to understand what approaches work best.
Circadian depression is not currently an official diagnosis in the DSM-5, and the study does not establish that body-clock disruption causes depression. Sleep, mood, metabolism and daily rhythms can influence one another, but the relationship remains under investigation.
Why it matters
Researchers suggest that treatments addressing sleep and circadian timing, such as light therapy or melatonin, may warrant further study. These are not established treatments for this proposed subtype, so anyone experiencing depression symptoms should seek an assessment from a qualified health professional rather than attempting to self-diagnose.
By examining how biological rhythms relate to depression, future research may help clinicians develop more individualized ways to assess and support patients.
