Researchers from the University of Colorado Boulder and the Channing Division of Network Medicine at Brigham and Women's Hospital in Boston, MA, have decided to investigate the relationship between sleep-wake preferences and the risk of depression.
They did so by looking at the data of a set of participants from the Nurses' Health Study II, a large, ongoing population study focused on identifying the risk factors for major chronic diseases in women.
"Our results show a modest link between chronotype and depression risk," notes lead study author Céline Vetter. "This," she adds, "could be related to the overlap in genetic pathways associated with chronotype and mood."
This is the biggest and most thorough study into the link between mood disorders and chronotype conducted to date. The team's findings are reported in the Journal of Psychiatric Research.