Distinct Mechanisms Underlie Associations Between Forms of Childhood Maltreatment and Disruptive Nocturnal Behaviors

Associations among early life adversity, sleep disturbances, and depressive symptoms in adolescent females and males: a longitudinal investigation

BACKGROUND

Exposure to adversity early in life (ELA) has been associated with elevated risk for depression during adolescence, particularly for females; the mechanisms underlying this association, however, are poorly understood. One potential mechanism linking ELA and sex differences in depressive symptoms is sleep disturbances, which increase during adolescence and are more common in females. Here, we examined whether sleep disturbances mediate the association between ELA and increases in depressive symptoms during adolescence and whether this mediation differs by sex.

METHODS

224 (N = 132 females) youth were recruited at age 9-13 years and assessed every 2 years across three timepoints. At the first timepoint, we conducted extensive interviews about stressful events participants experienced; participants provided subjective severity ratings of events and we objectively scored the severity of each event. Self-reported sleep disturbances and depressive symptoms were assessed at all timepoints. We conducted linear mixed models to estimate both initial levels and changes in sleep disturbances and depressive symptoms, and moderated mediation analyses to test whether initial levels and/or changes in sleep disturbances mediated the association of ELA (objective and subjective) with increases in depressive symptoms across adolescence and whether the mediations differed by sex.

RESULTS

While higher initial levels and increases in sleep problems were uniquely associated with increases in depressive symptoms for males and females, they were related to ELA differently by sex. For females, greater ELA (both objectively and subjectively rated) was associated with higher initial levels of sleep problems, which in turn were associated with increases in depressive symptoms from early to late adolescence. In contrast, for males, ELA exposure was not associated with either initial levels of, or increases in, sleep problems.

CONCLUSIONS

These findings highlight the role of sleep disturbances during the transition to adolescence in mediating sex differences in the effects of ELA on depressive symptoms.

Sleep, Emotional, and Behavioral Problems Among Youth Presenting to Treatment Following Sexual Abuse

Research indicates that sleep problems are fairly common in childhood. However, the relationship between child sexual abuse (CSA) and sleep problems and how sleep issues influence psychological symptoms in children presenting for treatment remain unclear. The purpose of this study was to examine the presence of sleep problems and the association between sleep problems and psychological symptoms in youth presenting to treatment following CSA. Participants included 276 non-offending caregiver-child dyads at pre-treatment and 106 dyads at post-treatment. Youth were 6 to 19 years old and predominately female (82.9%). Caregivers were 23 to 72 years old and predominately female (87.4%). Youth and caregivers identified as predominately European American (76.6% and 86.0%, respectively). Results indicated that caregiver endorsement of a particular youth sleep problem (as measured by the Child Behavior Checklist sleep items) at pre-treatment ranged between 17.9 and 51.4%. Sleep problems were positively associated with psychological symptoms per caregiver- and youth self-report. Interestingly, a substantial proportion of youth reported decreased sleep problems at the end of treatment even though the treatment did not target sleep issues. This study highlights the commonality of sleep problems in children who experienced sexual abuse. Findings suggest that CSA interventions that do not directly address sleep may be missing a component that can contribute to successful recovery. The results provide preliminary evidence that sleep problems and mental health concerns among youth who experienced CSA are associated, indicating a need for further investigation into the association and potential implications for treatment. Other implications for future research and treatment following CSA are discussed.

Childhood sleep: assessments, risk factors, and potential mechanisms

BACKGROUND

Sleep problem is a highly prevalent health issue among pediatric populations across the world. In this review, we aimed to identify risk factors contributing to sleep deficiency and poor sleep hygiene in children. Potential biological, psychosocial, and environmental mechanisms as well as research gaps in the literature are also discussed.

DATA SOURCES

A comprehensive search for relevant English language full-text, peer-reviewed publications was performed focusing on pediatric sleep studies from prenatal to childhood and adolescence in a variety of indexes in PubMed, SCOPUS, and Psych Info. Both relevant data based and systematic reviews are included.

RESULTS

This paper summarizes many risk factors for childhood sleep problems, including biological (e.g., genetics, gender, age and puberty, prenatal factors, postnatal factors); nutritional (e.g., macronutrients, micronutrients, omega-3 fatty acids, obesity); environmental (e.g., heavy metals, noise, light, air pollution); interpersonal (e.g., family, exposure to violence, screen media use, physical injury); and community/socioeconomic variables (e.g., racial/ethnicity and cultural factors, neighborhood conditions and socioeconomic status, school factors, public health disasters/emergencies), to better understand the development of sleep problems in children.

CONCLUSIONS

Poor childhood sleep is a multifactorial issue affected by a wide range of prenatal and early-life biological, environmental, and psychosocial risk factors and contributors. A better understanding of these risk factors and their mechanisms is an important first step to develop future research and prevention programs focusing on pediatric sleep problems.

Associations between Childhood Maltreatment and Behavioral Sleep Disturbances Across the Lifespan: A Systematic Review

Childhood maltreatment has a range of long-term developmental and health consequences. Emerging research suggests that sleep disturbances may be a key behavioral health risk factor implicated in the relationship between maltreatment and poor health across the lifespan. This systematic review examined the association between maltreatment and behavioral sleep disturbances in childhood and adulthood. Studies were identified through PsycINFO, PubMed, and alternative search strategies such as Google Scholar and reference list checks, with an end date of July 2021. Quantitative, peer-reviewed articles examining behavioral sleep outcomes and/or characteristics among maltreatment-exposed samples were included. We assessed the potential risk of bias by examining study design and sleep and maltreatment assessment methods. Across 73 studies included in this review, there was a robust association between childhood maltreatment and behavioral sleep disturbances. Findings suggest that linkages between maltreatment and sleep outcomes diverge with respect to maltreatment characteristics, type of behavioral sleep disturbance assessed, use of subjective versus objective measures, and study design. Given that behavioral sleep disturbances are modifiable, more research is needed that incorporates objective measures of sleep and longitudinal designs to identify specific points of intervention to mitigate the potential long-term impacts of childhood maltreatment on health across socio-demographically diverse populations.

Changes in objectively measured sleep among internationally adopted children in 1-year follow-up during the first years in new families

BACKGROUND

Psychosocial risks and environmental changes experienced by internationally adopted children may predict sleep problems, which are incidentally among the main concerns of adoptive parents. Several questionnaire studies have found sleep of internationally adopted children to be problematic, but none of those used an objective measure in a controlled study.

OBJECTIVE

To determine whether the objectively recorded sleep of internationally adopted children is worse than their controls who are living with their biological parents.

METHODS

To this case-control part of the Finnish Adoption Study, we recruited children who were adopted internationally to Finland between October 2012 and December 2016. Simultaneously, control children were recruited from 16 daycare centers. To assess sleep in children, actigraphy recordings were made twice, 1 year apart, between December 2013 and April 2018. In the adopted group, the first assessment took place 10 months after they had arrived in their families. The associations between adoption status and sleep parameters were analyzed using linear mixed modeling and adjusted for multiple potential confounders, including child age.

RESULTS

Seventy-eight internationally adopted children (boys 64%) aged 1-7 years and 99 controls (boys 53%) aged 2-6 years attended the first sleep recording. The recordings showed that the internationally adopted children slept longer (B = 0.48, 95% CI 0.23-0.73, P < 0.001) than the controls. There were no significant differences in sleep fragmentation or sleep efficiency between the groups. During the 1-year follow-up, the sleep patterns of the adopted children approached those of the controls.

CONCLUSIONS

The internationally adopted children spent more time in bed and slept more than their control children in both recordings. However, their sleep patterns were not very different from those of their peers and the differences appeared to vanish during the first years in their new family.

Association between sleep disorders and child violence assessed in Southern Brazil

Aims: identifying sleep disorders (SDs) in children who experienced child maltreatment.Methods: the study evaluated the sleep pattern of 123 children (from 2 to 10 years old), who received assistance with child maltreatment, based on the Children’s Sleep Habits Questionnaire (CSHQ) – applied in a medical consultation after confirmation of the veracity of the child’s report of a violation. The study applied the questionnaire to children seen by doctors in the sector for 11 months.Results: among the children evaluated, 66.7% had SDs. The sample profile was predominantly female (59.3%) and aged between 4 and 7 years old (48.8%). Physical violence was found in 40.7% of the children, in addition to sexual (35.8%), psychological (24.4%), negligence (14.6%) and other types of violence (OTV) (4.5%). SDs are significantly associated with sexual, psychological and OTV (p=0.016). Regarding the subscales, there was a significant difference between the age groups in the bedtime resistance (BR) factor score (p=0.033). The BR characteristic typifies sexual, psychological and OTV. Sleep anxiety (SA) typifies more psychological, sexual and OTV. Night awakenings (NAs) typify psychological, sexual and physical violence. According to the type of violence, significant differences were found in SA (p=0.039), NAs (p=0.026) and BR (p=0.004).Conclusions: the outcomes highlight the association between SDs and child maltreatment. Certain types of violence have a greater negative impact on children’s sleep and correlate with specific SD.

Reward prospect improves inhibitory control in female university students with a history of childhood sexual and physical abuse

BACKGROUND AND OBJECTIVES

Childhood abuse and neglect increase the risk for psychiatric disorders (e.g., depression and anxiety) during adulthood and have been associated with deficits in cognitive control. The specific mechanisms underlying these cognitive control deficits are still unknown.

METHODS

This study examined the expectation for reward to improve inhibitory control in young women (ages 18-35 years) with a history of childhood sexual and/or physical abuse (AG, N = 28), childhood emotional and/or physical neglect (NG, N = 30), or unaffected comparison women (HC, N = 40). They completed a previously validated rewarded (color-word) Stroop task and filled out questionnaires on depression, anxiety, and resilience.

RESULTS

Surprisingly, a significant group by reward interaction revealed larger performance benefits under reward prospect (relative to no-reward) for the AG group relative to both the NG and HC groups.

LIMITATIONS

A small sample size limiting generalizability.

CONCLUSIONS

These results demonstrate sensitivity of abused subjects to reward in modulating cognitive control and might aid in discussing whether using reward schedules during therapeutic interventions could be effective.

Nightmare experience and family relationships in healthy volunteers and nightmare disorder patients

BACKGROUND

Nightmares are associated with parental bonding styles and various psychiatric disorders, but the exact connections between different nightmare experience features and family relationships in healthy volunteers and nightmare disorder patients are still unclear.

METHODS

We therefore invited 62 nightmare disorder patients and 135 healthy volunteers to undergo tests of the Nightmare Experience Questionnaire (NEQ), the Family Relationship Questionnaire (FRQ), and the Plutchik - van Praag Depression Inventory (PVP).

RESULTS

Besides the higher nightmare frequency and the higher PVP and four NEQ scale scores, the nightmare disorder patients had higher scores of FRQ Paternal Abuse, and lower ones of General Attachment, Maternal Encouragement, Maternal Freedom Release, and Paternal Freedom Release. The PVP was correlated with some NEQ and FRQ scales in both healthy volunteers and patients, and it functioned as a mediator between Physical Effect and Maternal Dominance in patients. Regarding predicting NEQ by FRQ, Paternal Abuse predicted Physical Effect, Maternal Dominance predicted Physical Effect and Horrible Stimulation, General Attachment predicted Horrible Stimulation (-) in healthy volunteers; Maternal Dominance predicted Physical Effect, Meaning Interpretation, and Horrible Stimulation, Paternal Freedom Release predicted Physical Effect (-), and Paternal Dominance predicted Meaning Interpretation and nightmare frequency in patients.

CONCLUSIONS

Our study has demonstrated that the inappropriate family relationships were linked with different aspects of nightmare experience, especially in nightmare disorder patients.

Sleep problems and interpersonal violence in youth in care under the Quebec Child Welfare Society

OBJECTIVE

The objective this study was to investigate the relative contributions of gender, common mental health symptoms, and experiences of interpersonal violence to the presence of sleep disturbances in Youth in Care under Child Welfare Society admitted to residential facilities.

METHODS

A sample of 315 teenagers (14-18 years old) completed a self-reported questionnaire upon admission, followed by a medical consultation with a nurse and a physician. Information regarding experiences of interpersonal violence, mental health symptoms, and sleep disturbances was collected using a standardized questionnaire.

RESULTS

Anxiety, ADHD symptoms, and sexual abuse were associated with sleep disturbances, F(10, 264) = 5.95, p < 0.001. Results from hierarchical regression analyses revealed that experiences of interpersonal violence, more specifically sexual abuse, were associated with sleep disturbances over and beyond gender and the presence of mental health symptoms.

CONCLUSIONS

These results highlight practical implications for health professionals in terms of assessment and intervention for vulnerable youth exposed to interpersonal violence. Implications for research and practice are discussed.

Trauma characteristics and sleep impairment among trauma-exposed children

Trauma-related sleep difficulties are quite common and their functional and clinical importance are increasingly recognized. High rates of sleep problems have been documented among trauma-exposed adults, particularly those diagnosed with posttraumatic stress disorder (PTSD); however, research with trauma-exposed children is relatively limited. Research specifically with child samples is critical due to the numerous developmental and functional implications that may result from sleep impairment. Characteristics of the traumatic event may play a key role in understanding sleep difficulties, yet, these associations are not well understood among trauma-exposed children. The current study therefore investigated whether aspects of the traumatic event (i.e., type, nature, chronicity, age of onset, removal from home, and complex trauma) were related to higher levels of sleep disturbances among 276 treatment-seeking children ages 6-18 years (M = 10.88, SD = 3.39; 63.4% female; 62.7% Black). Sleep problems were common in this sample. Domestic and community violence exposure were associated with higher levels of select sleep difficulties, as were interpersonal trauma, chronic trauma, a trauma that began early in life, and complex trauma. Nonetheless, type of trauma and characteristics of the traumatic event were largely unrelated to sleep problems on either caregiver's or children's reports. Removal from the home was not linked with sleep impairment. Although findings signify the relevance of sleep disturbances among trauma-exposed children, trauma characteristics may have limited influence on sleep problems.

The Stress Acceleration Hypothesis of Nightmares

Adverse childhood experiences can deleteriously affect future physical and mental health, increasing risk for many illnesses, including psychiatric problems, sleep disorders, and, according to the present hypothesis, idiopathic nightmares. Much like post-traumatic nightmares, which are triggered by trauma and lead to recurrent emotional dreaming about the trauma, idiopathic nightmares are hypothesized to originate in early adverse experiences that lead in later life to the expression of early memories and emotions in dream content. Accordingly, the objectives of this paper are to (1) review existing literature on sleep, dreaming and nightmares in relation to early adverse experiences, drawing upon both empirical studies of dreaming and nightmares and books and chapters by recognized nightmare experts and (2) propose a new approach to explaining nightmares that is based upon the Stress Acceleration Hypothesis of mental illness. The latter stipulates that susceptibility to mental illness is increased by adversity occurring during a developmentally sensitive window for emotional maturation—the infantile amnesia period—that ends around age 3½. Early adversity accelerates the neural and behavioral maturation of emotional systems governing the expression, learning, and extinction of fear memories and may afford short-term adaptive value. But it also engenders long-term dysfunctional consequences including an increased risk for nightmares. Two mechanisms are proposed: (1) disruption of infantile amnesia allows normally forgotten early childhood memories to influence later emotions, cognitions and behavior, including the common expression of threats in nightmares; (2) alterations of normal emotion regulation processes of both waking and sleep lead to increased fear sensitivity and less effective fear extinction. These changes influence an affect network previously hypothesized to regulate fear extinction during REM sleep, disruption of which leads to nightmares. This network consists of a fear circuit that includes amygdala, hippocampus, and medial prefrontal cortex and whose substantial overlap with the stress acceleration findings allows the latter to be incorporated into a wider, more developmentally coherent framework.

Frontal brain asymmetry, childhood maltreatment, and low-grade inflammation at midlife

Frontal EEG asymmetry is thought to reflect variations in affective style, such that greater relative right frontal activity at rest predicts enhanced emotional responding to threatening or negative stimuli, and risk of depression and anxiety disorders. A diathesis-stress model has been proposed to explain how this neuro-affective style might predispose to psychopathology, with greater right frontal activity being a vulnerability factor especially under stressful conditions. Less is known about the extent to which greater relative right frontal activity at rest might be associated with or be a diathesis for deleterious physical health outcomes. The present study examined the association between resting frontal EEG asymmetry and systemic, low-grade inflammation and tested the diathesis-stress model by examining whether childhood maltreatment exposure interacts with resting frontal asymmetry in explaining inflammation. Resting EEG, serum inflammatory biomarkers (interleukin-6, C-reactive protein, and fibrinogen) and self-reported psychological measures were available for 314 middle-aged adults (age M=55.3years, SD=11.2, 55.7% female). Analyses supported the diathesis-stress model and revealed that resting frontal EEG asymmetry was significantly associated with inflammation, but only in individuals who had experienced moderate to severe levels of childhood maltreatment. These findings suggest that, in the context of severe adversity, a trait-like tendency towards greater relative right prefrontal activity may predispose to low-grade inflammation, a risk factor for conditions with inflammatory underpinnings such as coronary heart disease.

Adopted youth and sleep difficulties

Sleep is a critical component of healthy development for youth, with cascading effects on youth’s biological growth, psychological well-being, and overall functioning. Increased sleep difficulties are one of many disruptions that adopted youth may face throughout the adoption process. Sleep difficulties have been frequently cited as a major concern by adoptive parents and hypothesized in the literature as a problem that may affect multiple areas of development and functioning in adopted youth. However, there is limited research exploring this relationship. Using a biopsychosocial framework, this paper reviews the extant literature to explore the development, maintenance, and impact of sleep difficulties in adopted youth. Finally, implications for future research and clinical interventions are outlined.

The neurobiology of self-processing in abused depressed adolescents

Maltreatment is associated with chronic depression, high negative self-attributions, and lifetime psychopathology. Adolescence is a sensitive period for the formation of self-concept. Identifying neurobiomarkers of self-processing in depressed adolescents with and without maltreatment may parse the effects of trauma and depression on self-development and chronic psychopathology. Depressed adolescents (n = 86) maltreated due to omission (DO, n = 13) or commission (DCM, n = 28) or without maltreatment (DC, n = 45), and HCs (HC, n = 37) appraised positive and negative self-descriptors in the scanner. DCM and DO showed hypoactivity in the dorsal anterior cingulate cortex (dACC) while processing positive versus negative self-descriptors compared to DC youth, who in turn showed reduced dACC recruitment versus HC. HC youth showed the highest activation in the dACC and striatum during positive self-descriptors; these regions showed a linear decline in activity across DC, DO, and DCM. Low dACC activity to positive versus negative self-descriptors was linked to inadequate coregulation of children's emotions by parents. Negative self-cognitions prevalent in DCM and DO adolescents may be perpetuated by activity in the dACC and striatum. Reduced activation of the dACC and striatum for positive self-descriptors, coupled with enhanced activity for negative self-descriptors, may heighten the risk for persistent depression.

Annual Research Review: Sleep problems in childhood psychiatric disorders--a review of the latest science

BACKGROUND

Hippocrates flagged the value of sleep for good health. Nonetheless, historically, researchers with an interest in developmental psychopathology have largely ignored a possible role for atypical sleep. Recently, however, there has been a surge of interest in this area, perhaps reflecting increased evidence that disturbed or insufficient sleep can result in poor functioning in numerous domains. This review outlines what is known about sleep in the psychiatric diagnoses most relevant to children and for which associations with sleep are beginning to be understood. While based on a comprehensive survey of the literature, the focus of the current review is on the latest science (largely from 2010). There is a description of both concurrent and longitudinal links as well as possible mechanisms underlying associations. Preliminary treatment research is also considered which suggests that treating sleep difficulties may result in improvements in behavioural areas beyond sleep quality.

FINDINGS

To maximise progress in this field, there now needs to be: (a) greater attention to the assessment of sleep in children; (b) sleep research on a wider range of psychiatric disorders; (c) a greater focus on and examination of mechanisms underlying associations; (d) a clearer consideration of developmental questions and (e) large-scale well-designed treatment studies.

CONCLUSIONS

While sleep problems may sometimes be missed by parents and healthcare providers; hence constituting a hidden risk for other psychopathologies - knowing about these difficulties creates unique opportunities. The current excitement in this field from experts in diverse areas including developmental psychology, clinical psychology, genetics and neuropsychology should make these opportunities a reality.