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The COVID‐19 pandemic resulted in a reorganization of adolescents' routines, especially their sleep schedules. Utilising 175 caregiver‐adolescent dyads, the current study examined associations of biological (e.g., prenatal substance use), environmental (e.g., poverty), and relational (e.g., child maltreatment) subtypes of early life adversity (ELA) with various components of adolescents' sleep across the first year of the COVID‐19 pandemic. Relational ELA explained unique variance in adolescents' sleep disturbances, but not other sleep components, following short‐ and longer‐term exposure to the COVID‐19 pandemic. However, the direction of this association switched such that relational ELA predicted decreased sleep disturbances during the initial phase of the U.S. COVID‐19 pandemic in spring 2020 beyond pre‐pandemic levels, but, over time, contributed to increased sleep disturbances beyond early‐pandemic levels as the pandemic extended into the winter of 2020.

Prosocial and health protective behaviors are critical to contain the COVID‐19 pandemic, yet adolescents have been difficult to engage. Attachment security promotes adolescents’ capacities to navigate stress, and influences prosocial and health behaviors. Drawing on a diverse sample of 202 adolescents (48% female; 47.5% Latinx) this study evaluated relations among attachment, mental health, and prosocial and health protective responses to the COVID‐19 pandemic. Attachment security (age 12) predicted adolescents’ (age 15) COVID‐19 prosocial (f² = .201) and health protective behaviors (f² = .274) during the pandemic via smaller‐than‐expected increases in mental health symptoms above pre‐pandemic levels (age 14). Findings highlight the importance of attachment for supporting adolescents’ mental health responses to life stressors and promoting prosocial and health protective behaviors.

This investigation examined cross‐lagged relations between expressive control (i.e., management of expressed affect) and inhibitory control (i.e., management of behavior) to elucidate the development of self‐regulation across affective and behavioral domains. Regulation was assessed longitudinally at ages four, six, and eight using both observational laboratory tasks and teacher reports in a diverse sample of 250 children. Both observational and teacher‐reported models produced parallel results, with consistent prospective relations between expressive control and inhibitory control. In both models, better expressive control of affect at age four predicted better inhibitory control of behavior at six whereas better inhibitory control at age six predicted better expressive control at age eight. Cross‐domain longitudinal relations controlled for the stability of prior within‐domain regulation and concurrent cross‐domain relations. The replication of these findings across laboratory and school settings provides particularly robust evidence for these effects. This study demonstrated that clarifying developmental dynamics across domains of self‐regulation may be essential to understanding the full regulatory system.

Children's self‐regulation is a core adaptive system in child development. Physiological indices of regulation, particularly the autonomic nervous system (ANS), have garnered increased attention as an informative level of analysis in regulation research. Cardiography supports the simultaneous examination of both ANS branches via measures of pre‐ejection period (PEP) and respiratory sinus arrhythmia (RSA) as indicators of sympathetic and parasympathetic activity, respectively. However, despite their heavily intertwined functions, research examining autonomic coordination across sympathetic and parasympathetic systems is scarce. Moreover, extant efforts have favored static, mean level reactivity analyses, despite the dynamic nature of ANS regulation and the availability of analytic tools that can model these processes across time. This study drew on a sample of 198 six‐year‐old children from a diverse community sample (49.5% female, 43.9% Latinx) to examine dynamic autonomic coordination using bivariate latent change score modeling to evaluate bidirectional influences of sympathetic and parasympathetic activity over the course of a challenging puzzle completion task. Results indicated that children evidenced reciprocal sympathetic activation (i.e., PEP attenuation and RSA withdrawal) across the challenge task, and these regulatory responses were characterized by a temporally leading influence of PEP on lagging changes in RSA. The current findings contribute to our understanding of children's autonomic coordination while illustrating a novel analytic technique to advance ongoing efforts to understand the etiology and developmental significance of children's physiological self‐regulation.