0953 The Interaction Between Insomnia and Excessive Daytime Sleepiness on Cognitive and Somatic Depressive Symptoms

Abstract Introduction Sleep and mental health are Healthy People 2030 Public Health priorities. Emerging adults experience a combination of biosocial and environmental changes that contribute to increased susceptibility to sleep disturbances and poor mental health during the college years. Excessive daytime sleepiness and insomnia represent distinct sleep disturbances, and both have been linked to depressive symptomatology. However, few studies have examined their interactions on specific mood symptoms. This study explored the moderating effect of excessive daytime sleepiness on the relationship between insomnia and cognitive and somatic depressive symptoms. Methods Emerging adults (N=104, Mean age=20.22± .78, 81.7% Female) completed self-report measures on sleep and depressive symptoms. The insomnia severity index assessed for the nature, severity, and impact of insomnia symptoms, with higher scores indicating greater symptom severity. Excessive daytime sleepiness was assessed using the Epworth sleepiness scale. The Beck depression inventory (BDI-II) assessed for the presence and intensity of overall depressive symptoms, with cognitive and somatic depressive symptoms derived from subscales. Higher scores represented greater depressive severity. All statistical analyses were conducted using IBM SPSS version 29, along with Hayes PROCESS macro for moderation analyses. Results Data showed a positive correlation between insomnia severity and excessive daytime sleepiness (r=.24, p=.01). We also found significant associations between insomnia severity and overall depressive symptoms (r=.52, p.001), cognitive depressive symptoms (r=.42, p.001) and somatic depressive symptoms (r=.58, p.001). Findings indicated significant main effects of insomnia (b=.95 ±.24, p.001) and excessive daytime sleepiness (b=.72 ±.31, p=.02) on cognitive depressive symptoms, and excessive daytime sleepiness significantly attenuated the association between insomnia and cognitive depressive symptoms (b=-.05 ±.02, p=.03). Results also indicated a significant main effect of insomnia, but not excessive daytime sleepiness (b=.05 ±.22, p=.81) on somatic depressive symptoms (b=.49 ±.17, p=.01). Additionally, there was no interaction between insomnia and excessive daytime sleepiness on somatic depressive symptoms (b=-.001 ±.02, p=.96). Conclusion Data indicates that sleep disturbances are risk factors that need to be considered and addressed when treating depressive symptoms among emerging adults. Support (if any) This study was funded by a Center Grant from the National Institutes of General Medical Sciences (Grant # P20GM103653).