Health & body · 2025
How was sleep linked to depressive symptoms and cognition in Chinese adults?
In a longitudinal analysis of 3,136 Chinese adults aged 45 and older, sleep duration acted as a bridge between depressive symptoms and cognitive functions. The symptom described as “bothered” predicted all other symptoms on the depression scale, and network patterns differed between women and men.
Details
Sleep duration, cognitive function, and depression are known to have bidirectional associations, but their symptom-level interactions over time remain poorly characterized in China’s rapidly growing aging population. The researchers aimed to clarify these dynamics using a novel and to guide targeted interventions, focusing on sex-specific pathways.
They conducted a longitudinal temporal network analysis of 3,136 Chinese adults aged 45 or older in the China Health and Retirement Longitudinal Study (CHARLS), using five waves from 2011, 2013, 2015, 2018, and 2020. A graphical vector autoregressive (GVAR) model mapped interdependencies among sleep duration, cognitive performance measured with the Mini-Mental State Examination (MMSE), and depressive symptoms measured with the 10-item Center for Epidemiologic Studies Depression Scale (CESD-10). The researchers also examined sex-specific differences in network structure.
The symptom “bothered” predicted all other CESD-10 symptoms. Sleep had significant predictive links with the CESD-10 symptoms “bothered,” “drained,” and “depressed,” as well as with the MMSE function of numerical ability. Sleep duration also acted as a bridge between depressive symptoms and cognitive functions.
Longitudinal network structures differed significantly between sexes, and sex-specific analyses revealed distinct patterns. Among women, the “bothered” node significantly predicted several outcomes over time. Among men, the temporal network was sparser, and the depression-domain node “stuck” was predominantly influenced by other nodes.
The researchers concluded that emotional distress, especially the “bothered” symptom, plays a central role in depressive symptoms and cognitive decline. They suggested that the bridging effect of short sleep duration highlights the potential of interventions addressing both sleep and emotional distress to alleviate depressive symptoms and delay cognitive deterioration in older adults.
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