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The present study aimed at evaluating how post-traumatic stress symptoms (PTSS) are associated with rest-activity circadian and sleep-related parameters, assessed both subjectively (via questionnaires) and objectively (via actigraphy). Specifically, we explored whether chronotype could moderate the association between sleep/circadian parameters and PTSS. Participants (n = 120 adults; mean age 35.6 ± 14; 48 male) were assessed through the Trauma and Loss Spectrum Self Report (TALS-SR) for lifetime PTSS, the reduced version of the Morningness-Eveningness Questionnaire (rMEQ) for chronotype, the Pittsburgh Sleep Quality Index (PSQI) for self-reported sleep quality, and wrist actigraphy for sleep and circadian parameters. Eveningness, poor self-reported sleep quality, lower sleep efficiency (SE), lower interdaily stability (IS), and higher intradaily variability (IV) were correlated with higher TALS-SR scores. Regression analyses showed that IV, SE, and PSQI remained associated with TALS symptomatic domains after adjusting for potentially confounding factors (age and gender). Moderation analysis showed that only the PSQI remained significantly associated with TALS symptomatic domains; however, the interaction with chronotype was not significant. Targeting self-reported sleep disturbances and rest-activity rhythms fragmentation could mitigate PTSS. Although the effect of chronotype as a moderator of the associations between sleep/circadian parameters and PTSS was not significant, eveningness was associated with higher TALS scores, thus confirming the vulnerability of evening types to worse stress reactions. [ABSTRACT FROM AUTHOR]

This study aimed to explore the relationship between chronotype and resilience, sleep quality, and post-traumatic stress reactions during the first COVID-19 lockdown in Italy. An online survey was distributed through social networks during forced home confinement, collecting data from1298 participants of 19 different Italian regions. Chronotype was evaluated using the reduced version of the Morningness/Eveningness Questionnaire (rMEQ); sleep quality was assessed by the Pittsburgh Sleep Quality Index (PSQI); resilience levels were measured by the 10-item version of the Connor-Davidson Resilience Scale (CD-RISC10); post-traumatic stress reactions were assessed by the 6-item version of the Impact of Event Scale (IES6). Resilience and sleep quality were significantly lower in the evening compared to non-evening types, as well as in females as compared to males. Moreover, resilience was negatively correlated with post-traumatic stress reactions and positively correlated with sleep quality. A negative correlation was also reported between sleep quality and post-traumatic stress reactions. Sleep quality was identified as a possible mediator between chronotype and resilience, and between resilience and post-traumatic stress reactions, after controlling for age and sex. These findings provide new insights into the role of chronotype in adapting to continuous stressful situations. Sleep quality seems to mediate the causal path between the antecedents of resilience and the development of trauma. Further research is needed to explore the suitability of primary interventions based on chronobiology and sleep hygiene to mitigate the impact of pandemic-related home confinement measures on mental health among the general population. [ABSTRACT FROM AUTHOR]