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NEARLY ONE IN four cases of depression may fall into this category. A study published in the British Journal of Psychiatry identified “circadian depression,” and people with it have an internal 24-hour clock that’s out of sync with their external environment.

Like really out of sync. We’re not talking about jet lag . This is when your body’s internal timing network just can’t regulate your body’s systems.

It's important to get this out of the way upfront: Circadian depression isn't in the DSM-5—the “psychiatry bible” mental health professionals use to make diagnoses. In other words, it's not an official condition yet . But it’s important to know about. We had mental health experts break it down.

What Is Circadian Depression?

CIRCADIAN DEPRESSION IS a subtype of depression caused by circadian disruption, which is when your body’s circadian rhythm doesn't align with your external environment.…