A newly proposed subtype of depression called circadian depression is drawing attention from researchers studying the relationship between sleep patterns and mental health. The condition links disruptions in the body's internal clock with changes in mood, alertness and sleep.

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Researchers at the University of Sydney identified this pattern in a study published in the British Journal of Psychiatry. According to the findings, nearly 25% of people with severe or recurrent depression may experience this distinct circadian subtype.

The body's circadian rhythm regulates its natural 24-hour cycle, including sleep, wakefulness and hormone activity. When this internal timing system becomes disrupted, it may affect emotional well-being and make it harder to maintain regular sleep patterns.

Nighttime can also be particularly difficult for people experiencing depression. Reduced daytime distractions, sleep-related frustration and repetitive negative thoughts may contribute to increased sadness and anxiety during the evening or night.

Researchers have also highlighted possible differences in how people with this pattern respond to conventional antidepressant treatments. The findings suggest that approaches targeting the biological clock may deserve greater attention alongside established depression treatments.

Potential approaches include morning light therapy, carefully timed melatonin and consistent sleep-wake schedules. Maintaining healthy sleep habits, limiting bright screens and avoiding caffeine late in the evening may also support regular sleep patterns.

However, circadian depression is a proposed research subtype, not a diagnosis people can establish from sleep symptoms alone. Anyone experiencing persistent low mood or sleep disruption should consult a qualified healthcare professional for assessment and appropriate treatment.