Sleep problems outperform depression and hopelessness as cross-sectional and longitudinal predictors of suicidal ideation and behavior in young adults in the military

Sleep Disturbances and Suicidal Behavior

Sleep disturbances, particularly insomnia, nightmares, and excessive daytime sleepiness (EDS), are significant, proximal, and modifiable risk factors for suicidal ideation and behaviors (SIB) and could be targeted for preventative interventions. In this chapter, we review the evidence supporting the association of insomnia, nightmares, and EDS with SIB. We also describe these sleep disturbances in the general population, as well as their association with psychiatric disorders. A PubMed search was conducted to identify the relevant literature. Insomnia is very frequent across mental disorders, but SIB patients are particularly exposed. Specific interventions focused on insomnia are useful in contending suicidal ideation. Nightmares seem to constitute an independent risk factor for SIB, beyond insomnia, particularly in young people and when experienced frequently. The evidence regarding the association of EDS and SIB is less clear and probably explained by the reduction of health-related quality of life and comorbid depression. The mechanisms underlying the relationship between sleep disturbances and SIB as well as the role of potential confounders and future perspectives in this field are also discussed.

Shared correlates of prescription drug misuse and severe suicide ideation among clinical patients at risk for suicide

OBJECTIVE

Unintentional drug overdose and suicide have emerged as public health problems. Prescription drug misuse can elevate risk of overdose. Severe suicidal ideation increases risk of suicide. We identified shared correlates of both risk factors to inform cross-cutting prevention efforts.

METHODS

We conducted a cross-sectional study using the Military Suicide Research Consortium's Common Data Elements survey; 2012-2017 baseline data collected from 10 research sites were analyzed. The sample included 3962 clinical patients at risk of suicide. Factors examined in relation to the outcomes, prescription drug misuse and severe suicidal ideation, included demographic characteristics and symptoms of: hopelessness; anxiety; post-traumatic stress disorder; alcohol use; other substance use; prior head/neck injury; insomnia; and belongingness. Poisson regression models with robust estimates provided adjusted prevalence ratios (aPRs) and 97.5% confidence intervals (CIs).

RESULTS

Medium and high (vs. low) levels of insomnia were positively associated with prescription drug misuse (aPRs p < 0.025). Medium (vs. low) level of insomnia was positively associated with severe suicidal ideation (aPR: 1.09; CI: 1.01-1.18). Medium and high (vs. low) levels of perceived belongingness were inversely associated with both outcomes (aPRs p < 0.025).

CONCLUSIONS

Research should evaluate whether addressing sleep problems and improving belongingness can reduce prescription drug misuse and suicidal ideation simultaneously.

Posttraumatic stress disorder symptom clusters, suicidal ideation, and social support in a clinical adolescent sample

Posttraumatic stress disorder (PTSD) is a risk factor for adolescent suicidal ideation (SI). This study explored the relation between PTSD symptom clusters and SI, and whether social support moderates this association, in a cross-sectional, adolescent, clinical sample (N = 125). We hypothesized that each cluster would be positively associated with SI severity and that social support would buffer these associations. Only the persistent avoidance cluster was significantly associated with SI severity. Further, social support moderated this association. Results highlight the positive association between persistent avoidance symptoms of PTSD and SI and suggest that bolstering social support serves a protective function.

Suicidal ideation among nurses: Unique and cumulative effects of different subtypes of sleep problems

BACKGROUND

Nurses have high rates of sleep problems, and higher risk of suicide than the general population. However, there is no empirical evidence showing the extent to which sleep problems among nurses are related to suicidal ideation.

METHODS

Multistage stratified cluster sampling was performed to recruit nurses from tertiary hospitals in Shandong, China. Item 9 of the Patient Health Questionnaire-9 was used to assess suicidal ideation. The Pittsburgh Sleep Quality Index was used to assess different subtypes of sleep problems.

RESULTS

Overall prevalence of suicidal ideation among the sample was 10.8%. Nurses with sleep problems were at high risk for suicidal ideation (^bOR = 1.79, 95% CI = 1.20-2.65). Among different sleep problem subtypes, only "cannot breathe comfortably" was independently related to suicidal ideation. Different subtypes of sleep problems had cumulative effects on suicidal ideation: the more subtypes of sleep problems nurses experienced, the higher the likelihood of suicidal ideation.

LIMITATIONS

The cross-sectional study design prevents inferring causation, and the use of self-report measures may lead to recall bias. Other physical/mental conditions, besides depression, were not assessed. Statistical power may have been insufficient due to the small sub-sample who reported suicidal ideation. Also, the generalizability of the results is limited, as the sample only comprised nurses in tertiary hospitals.

CONCLUSIONS

Nurses experiencing sleep problems were associated with increased likelihood of suicidal ideation. It may be beneficial to incorporate sleep problems into routine screening and intervention for suicide prevention in clinical practice.

Assessment of near-term risk for suicide attempts using the suicide crisis inventory

BACKGROUND

The Suicide Crisis Syndrome (SCS) describes a pre-suicidal mental state marked by entrapment accompanied by affective disturbances, loss of cognitive control, hyperarousal and social withdrawal. This study tested the consistency and validity of the Suicide Crisis Inventory (SCI), a proposed measure of SCS severity, amongst a large, heterogeneous patient sample.

METHODS

The SCI was used to assess 867 adult psychiatric inpatients and outpatients. Confirmatory factor analysis, logistic regressions and area under the curve analyses (AUC) were used to examine internal structure, construct validity and predictive validity for suicide ideation, plan and attempt one-month post-assessment.

RESULTS

The five-factor model of the SCS demonstrated good fit and excellent internal consistency. SCI scores indicated significant associations but non-redundancy with depression, anxiety, and independence from other dimensions of psychiatric distress. SCI scores specifically predicted suicide attempts with an AUC of 0.733 and odds ratio=8.62 (p<0.001) at optimal cut-off point. SCI incremental predictive validity over and beyond suicidal ideation and attempts history reported at baseline was supported for predicting suicide attempts (β= 0.012, S.E = 0.006; p=0.046).

LIMITATIONS

The SCI is subject to self-report bias and does not include the SCS social withdrawal component. Follow-up assessment retention was partial (68%, n=591).

CONCLUSION

The SCI is validated as a tool for the assessment of the SCS intensity and of imminent suicidal behavior. The SCI is suggested as a tool that could aid both researchers and clinicians in comprehensive assessment of a pre-suicidal mental state within moderate to high-risk populations, regardless of self-report on suicidal intent.

Sleep and suicide: A systematic review and meta-analysis of longitudinal studies

The current review provides a quantitative synthesis of the empirical literature on sleep disturbance as a risk factor for suicidal thoughts and behaviors (STBs). A systematic search of PsycINFO, MEDLINE, and the references of prior reviews resulted in 41 eligible studies included in this meta-analysis. Sleep disturbance, including insomnia, prospectively predicted STBs, yielding small-to-medium to medium effect sizes for these associations. Complicating interpretation of these findings however, is that few studies of suicidal ideation and suicide attempts, as well as none of suicide deaths, assessed short-term risk (i.e., employed follow-up assessments of under a month). Such studies are needed to evaluate current conceptualizations of sleep dysregulation as being involved in acute risk for suicidal behavior. This want of short-term risk studies also suggests that current clinical recommendations to monitor sleep as a potential warning sign of suicide risk has a relatively modest empirical basis, being largely driven by cross-sectional or retrospective research. The current review ends with recommendations for generating future research on short-term risk and greater differentiation between acute and chronic aspects of sleep disturbance, and by providing a model of how sleep disturbance may confer risk for STBs through neuroinflammatory and stress processes and associated impairments in executive control.

Insomnia Symptoms and Suicide-Related Ideation in U.S. Army Service Members

Background: Insomnia has been identified as a key risk factor for suicide, though most studies have been limited to global measures of these constructs. The aim of the present study was to evaluate the link between insomnia symptoms and five different aspects of suicide-related ideation. Participants: 1,160 active U.S. Army service members (719 male; M_age = 31.2; SD_age = 8.62). Methods: As part of an archival analysis, retrospectively assessed insomnia, depression, anxiety symptoms, as well as suicide-related ideation, were evaluated. Suicide-related ideation was assessed in terms of: thoughts of death, thoughts of suicide, suicidal plan, suicidal intent, and suicidal communication. Results: Subjects with clinically significant insomnia symptoms were 3.5 times more likely to report any suicide-related ideation, and approximately 3 times more likely to report thoughts of death and thoughts of suicide. More frequent nocturnal awakenings (i.e., waking up three or more times during a single night) were associated with a greater likelihood of reporting thoughts of death or suicide, whereas greater middle insomnia (i.e., waking up and having difficulty getting back to sleep) was associated with lower odds of experiencing thoughts of suicide, suicidal plan, and suicidal intent. Conclusions: A more refined delineation of insomnia and suicide-related ideation may serve to clarify the nature of the association, and potentially offer some clues as to the underlying mechanisms. With regard to potential clinical implications, the results support that careful assessment of insomnia symptoms, suicide-related ideation, and their respective subtypes, is important and may influence how we estimate risk for suicide.

Suicidal Ideation and Insomnia in Bipolar Disorders: Idéation suicidaire et insomnie dans les troubles bipolaires

OBJECTIVE

Bipolar disorder (BD) confers elevated suicide risk and associates with misaligned circadian rhythm. Real-time monitoring of objectively measured sleep is a novel approach to detect and prevent suicidal behavior. We aimed at understanding associations between subjective insomnia and actigraphy data with severity of suicidal ideation in BDs.

METHODS

This prospective cohort study comprised 76 outpatients with a BD aged 18 to 65 inclusively. Main measures included 10 consecutive days of wrist actigraphy; the Athens Insomnia Scale (AIS); the Montgomery-Åsberg Depression Rating Scale (MADRS); the Quick Inventory of Depressive Symptoms-16, self-rating (QIDS-SR-16); and the Columbia Suicide Severity Rating Scale. Diagnoses, medications, and suicide attempts were obtained from chart review.

RESULTS

Suicidal ideation correlated moderately with subjective insomnia (AIS with QIDS-SR-16 item 12 ρ =0.26, P = 0.03; MADRS item 10 ρ = 0.33, P = 0.003). Graphical sleep patterns showed that suicidal patients were enriched among the most fragmented sleep patterns, and this was confirmed by correlations of suicidal ideation with actigraphy data at 2 visits. Patients with lifetime suicide attempts (n = 8) had more varied objective sleep (a higher standard deviation of center of daily inactivity [0.64 vs. 0.26, P = 0.01], consolidation of daily inactivity [0.18 vs. 0.10, P = <0.001], sleep offset [3.02 hours vs. 1.90 hours, P = <0.001], and total sleep [105 vs. 69 minutes, P = 0.02], and a lower consolidation of daily inactivity [0.65 vs. 0.79, P = 0.03]).

CONCLUSIONS

Subjective insomnia, a nonstigmatized symptom, can complement suicidality screens. Longer follow-ups and larger samples are warranted to understand whether real-time sleep monitoring predicts suicidal ideation in patient subgroups or individually.

Material hardship, perceived stress, and health in early adulthood

Purpose

We examined the associations between material hardship and health outcomes in early adulthood and the extent to which these associations are mediated by perceived stress.

Methods

We used wave I and IV of the National Longitudinal Study of Adolescent Health, a nationally representative survey of young adults aged 18–34 years old (n = 13,313). Multivariate logistic regression and decomposition methods were used to evaluate the associations between types and depth of material hardship (food, bill-paying, and health resource hardship), health outcomes (self-rated health, depression, sleep problems, and suicidal thoughts) in early adulthood, and the extent to which these associations were mediated by perceived stress.

Results

The adjusted odds of fair or poor health status, depression, sleep problems, and suicidal thoughts were higher among individuals with material hardship than counterparts without. A considerable proportion of the association between material hardship and health outcomes was attributable to perceived stress.

Conclusions

Material hardship is associated with adverse health outcomes in early adulthood, and these relationships are robust after accounting for various sociodemographic characteristics and family background. Perceived stress accounted for a sizable portion of the effects of material hardship on health.

Public Health Implications

Efforts to promote health equity in young adults should focus on material hardship and associated stressful conditions.

Brief CBT for insomnia delivered in primary care to patients endorsing suicidal ideation: a proof-of-concept randomized clinical trial

Insomnia co-occurs frequently with major depressive disorder (MDD) and posttraumatic stress disorder (PTSD); all three conditions are prevalent among primary care patients and associated with suicidal ideation (SI). The purpose of the article was to test the effects of a brief cognitive behavioral therapy for insomnia (bCBTi) and the feasibility of delivering it to primary care patients with SI and insomnia in addition to either MDD and/or PTSD. Fifty-four patients were randomized to receive either bCBTi or treatment-as-usual for MDD and/or PTSD. The primary outcome was SI intensity as measured by the Columbia-Suicide Severity Rating Scale; secondary clinical outcomes were measured by the Insomnia Severity Index, Patient Health Questionnaire for depression, and PTSD Symptom Checklist. Effect sizes controlling for baseline values and sample size were calculated for each clinical outcome comparing pre-post differences between the two conditions with Hedge's g. The effect size of bCBTi on SI intensity was small (0.26). Effects were large on insomnia (1.91) and depression (1.16) with no effect for PTSD. There was a marginally significant (p = .069) effect of insomnia severity mediating the intervention's effect on SI. Findings from this proof-of-concept trial support the feasibility of delivering bCBTi in primary care and its capacity to improve mood and sleep in patients endorsing SI. The results do not support bCBTi as a stand-alone intervention to reduce SI, but this or other insomnia interventions may be considered as components of suicide prevention strategies.

Posttraumatic Stress Disorder, Suicidal Ideation, and Suicidal Self-Directed Violence Among U.S. Military Personnel and Veterans: A Systematic Review of the Literature From 2010 to 2018

Rates of suicide and posttraumatic stress disorder remain high among United States military personnel and veterans. Building upon prior work, we conducted a systematic review of research published from 2010 to 2018 regarding: (1) the prevalence of suicidal ideation, suicide attempt, and suicide among United States military personnel and veterans diagnosed with posttraumatic stress disorder; (2) whether posttraumatic stress disorder was associated with suicidal ideation, suicide attempt, and suicide among United States military personnel and veterans. 2,106 titles and abstracts were screened, with 48 articles included. Overall risk of bias was generally high for studies on suicidal ideation or suicide attempt and low for studies on suicide. Across studies, rates of suicidal ideation, suicide attempt, and suicide widely varied based on study methodology and assessment approaches. Findings regarding the association between posttraumatic stress disorder diagnosis with suicidal ideation and suicide were generally mixed, and some studies reported that posttraumatic stress disorder was associated with lower risk for suicide. In contrast, most studies reported significant associations between posttraumatic stress disorder and suicide attempt. These findings suggest complex associations between posttraumatic stress disorder and suicidal ideation, suicide attempt, and suicide, which are likely influenced by other factors (e.g., psychiatric comorbidity). In addition, most samples were comprised of veterans, rather than military personnel. Further research is warranted to elucidate associations between posttraumatic stress disorder and suicidal ideation, suicide attempt, and suicide, including identification of moderators and mediators of this relationship. Addressing this among United States military personnel, by gender, and in relation to different trauma types is also necessary.

Sleep disturbances as risk factors for suicidal thoughts and behaviours: a meta-analysis of longitudinal studies

In recent years, there has been a growing interest in understanding the relationship between sleep and suicide. Although sleep disturbances are commonly cited as critical risk factors for suicidal thoughts and behaviours, it is unclear to what degree sleep disturbances confer risk for suicide. The aim of this meta-analysis was to clarify the extent to which sleep disturbances serve as risk factors (i.e., longitudinal correlates) for suicidal thoughts and behaviours. Our analyses included 156 total effects drawn from 42 studies published between 1982 and 2019. We used a random effects model to analyse the overall effects of sleep disturbances on suicidal ideation, attempts, and death. We additionally explored potential moderators of these associations. Our results indicated that sleep disturbances are statistically significant, yet weak, risk factors for suicidal thoughts and behaviours. The strongest associations were found for insomnia, which significantly predicted suicide ideation (OR 2.10 [95% CI 1.83-2.41]), and nightmares, which significantly predicted suicide attempt (OR 1.81 [95% CI 1.12-2.92]). Given the low base rate of suicidal behaviours, our findings raise questions about the practicality of relying on sleep disturbances as warning signs for imminent suicide risk. Future research is necessary to uncover the causal mechanisms underlying the relationship between sleep disturbances and suicide.

Examining Insomnia During Intensive Treatment for Veterans with Posttraumatic Stress Disorder: Does it Improve and Does it Predict Treatment Outcomes?

Previous research has demonstrated that sleep disturbances show little improvement with evidence-based psychotherapy for posttraumatic stress disorder (PTSD); however, sleep improvements are associated with PTSD treatment outcomes. The goal of the current study was to evaluate changes in self-reported insomnia symptoms and the association between insomnia symptoms and treatment outcome during a 3-week intensive treatment program (ITP) for veterans with PTSD that integrated cognitive processing therapy (CPT), mindfulness, yoga, and other ancillary services. As part of standard clinical procedures, veterans (N = 165) completed self-report assessments of insomnia symptoms at pre- and posttreatment as well as self-report assessments of PTSD and depression symptoms approximately every other day during treatment. Most veterans reported at least moderate difficulties with insomnia at both pretreatment (83.0%-95.1%) and posttreatment (69.1-71.3%). Statistically significant reductions in self-reported insomnia severity occurred from pretreatment to posttreatment; however, the effect size was small, d = 0.33. Longitudinal mixed-effects models showed a significant interactive effect of Changes in Insomnia × Time in predicting PTSD and depression symptoms, indicating that patients with more improvements in insomnia had more positive treatment outcomes. These findings suggest that many veterans continued to struggle with sleep disruption after a 3-week ITP, and successful efforts to improve sleep could lead to better PTSD treatment outcomes. Further research is needed to establish how adjunctive sleep interventions can be used to maximize both sleep and PTSD outcomes.

Sleep quality and its impacts on quality of life among military personnel in remote frontier areas and extreme cold environments

BACKGROUND

Poor sleep quality negatively affects the readiness of military operations and is also associated with the development of mental health disorders and decreased quality of life. The purpose of this study was to investigate the sleep quality of military personnel from remote boundaries of China and its relationship with coping strategies, anxiety, and health-related quality of life (HRQoL).

METHODS

A cross-sectional survey was performed among military officers and soldiers from a frontier defence department and an extreme cold environment. The participants were surveyed using the Pittsburgh Sleep Quality Index (PSQI), Trait Coping Style Questionnaire (TCSQ), Self-rating Anxiety Scale (SAS), and Short Form Health Survey (SF-36).

RESULTS

A total of 489 military officers and soldiers were included. The participants had a mean age of 22.29 years. The median overall PSQI score was 7.0 (IQR, 4.0 ~ 9.0), with 40.9% (200/489) of the subjects reporting poor sleep quality. The difficulties with sleep were mainly related to daytime dysfunction due to disrupted sleep, sleep latency, and subjective sleep quality. The median score of the SF-36 physical component was 83.5 (IQR, 73.0 ~ 90.5), and the median score of the mental component was 74.1 (IQR, 60.4 ~ 85.1). Significant correlations were found between the PSQI and SF-36 (r = - 0.435, P <  0.01). Anxiety symptoms, marital status, educational background, and global PSQI score were demonstrated as predictors of a low SF-36 physical component by multiple regression analysis (F = 17.06, P <  0.001, R2 = 0.117).

CONCLUSIONS

Sleep difficulty is a prevalent and underestimated problem in the military that negatively influences HRQoL, especially in physical and social functioning. Evaluation of and education on pain were recommended because of body pain and its negative impacts on sleep quality, coping strategies, anxious emotions and HRQoL.

Testing Suicide Risk Prediction Algorithms Using Phone Measurements With Patients in Acute Mental Health Settings: Feasibility Study

BACKGROUND

Digital phenotyping and machine learning are currently being used to augment or even replace traditional analytic procedures in many domains, including health care. Given the heavy reliance on smartphones and mobile devices around the world, this readily available source of data is an important and highly underutilized source that has the potential to improve mental health risk prediction and prevention and advance mental health globally.

OBJECTIVE

This study aimed to apply machine learning in an acute mental health setting for suicide risk prediction. This study uses a nascent approach, adding to existing knowledge by using data collected through a smartphone in place of clinical data, which have typically been collected from health care records.

METHODS

We created a smartphone app called Strength Within Me, which was linked to Fitbit, Apple Health kit, and Facebook, to collect salient clinical information such as sleep behavior and mood, step frequency and count, and engagement patterns with the phone from a cohort of inpatients with acute mental health (n=66). In addition, clinical research interviews were used to assess mood, sleep, and suicide risk. Multiple machine learning algorithms were tested to determine the best fit.

RESULTS

K-nearest neighbors (KNN; k=2) with uniform weighting and the Euclidean distance metric emerged as the most promising algorithm, with 68% mean accuracy (averaged over 10,000 simulations of splitting the training and testing data via 10-fold cross-validation) and an average area under the curve of 0.65. We applied a combined 5×2 F test to test the model performance of KNN against the baseline classifier that guesses training majority, random forest, support vector machine and logistic regression, and achieved F statistics of 10.7 (P=.009) and 17.6 (P=.003) for training majority and random forest, respectively, rejecting the null of performance being the same. Therefore, we have taken the first steps in prototyping a system that could continuously and accurately assess the risk of suicide via mobile devices.

CONCLUSIONS

Predicting for suicidality is an underaddressed area of research to which this paper makes a useful contribution. This is part of the first generation of studies to suggest that it is feasible to utilize smartphone-generated user input and passive sensor data to generate a risk algorithm among inpatients at suicide risk. The model reveals fair concordance between phone-derived and research-generated clinical data, and with iterative development, it has the potential for accurate discriminant risk prediction. However, although full automation and independence of clinical judgment or input would be a worthy development for those individuals who are less likely to access specialist mental health services, and for providing a timely response in a crisis situation, the ethical and legal implications of such advances in the field of psychiatry need to be acknowledged.

The association between baseline insomnia symptoms and future suicide attempts within an intensive outpatient treatment program for suicide

This study examines the prospective relationship between insomnia symptoms and suicide attempts in high-risk youth. We obtained depressive symptoms, insomnia symptoms, and suicide ideation measures from clinical records of 206 adolescents ages 12-17 at entry and discharge from a suicide prevention intensive outpatient program. Information about whether the participant made a suicide attempt was available through six months after discharge. Patients were mainly girls (79.1%; n = 163) with depression (89.8%; n = 185). Associations between insomnia symptoms, attempts within 6 months of discharge, persistent insomnia symptoms, and suicide ideation at discharge were tested with multiple regression analyses. Entry insomnia symptoms were prospectively associated with attempts when controlling for age, sex, and previous attempts, but insomnia symptoms at discharge were not. Suicide ideation at discharge was associated both with entry insomnia symptoms and attempts within 6 months of discharge. When entry and discharge suicide ideation were controlled, the association between entry insomnia symptoms and attempts lost significance. However, the association between discharge ideation and attempts remained significant. Insomnia symptoms contribute indirectly to suicide attempt risk after discharge. Intensive treatment for ideation and reducing insomnia symptoms could reduce discharge suicide risk and subsequent suicide attempts.

Self-reported sleep disturbance in ambulance attendances for suicidal ideation and attempted suicide between 2012 and 2017

BACKGROUND

Sleep disturbances are among the top-ten warning signs for suicide, however there has been limited investigation of the relationship between these variables in acute presentations, particularly community settings. We examined ambulance attendances for suicide ideation and attempt to explore the role of sleep and co-morbid factors (mental health symptoms, attendance time, and alcohol and benzodiazepine use).

METHODS

Coded clinical records from Ambulance Victoria for the period 1 January 2012 to 30 June 2017 were analysed.

RESULTS

Paramedics attended 97,198 cases of suicidal ideation or suicide attempt during the study period. Just over half (56.4%) of these were for suicidal ideation, and 43.6% were for attempted suicide. Depression symptomology-related attendances were more common than those for anxiety and despite a lower proportion of both sleep and current anxiety-related symptoms, benzodiazepine use was significantly more common in attendances for suicide attempts (25.9%) than for ideation (2.2%). Co-morbid benzodiazepine use was associated with attempted suicide (OR: 10.37 (10.04-10.72), in a hierarchical regression model.

LIMITATIONS

Data represent self-report/paramedic observation only, and do include validated measures of sleep or drug use. Sleep disturbance is likely under recorded in ambulance attendances given the primary role of paramedics is to stabilise patients, and minimise risk of harm during transport.

CONCLUSION

This study reports internationally unique data, and provides the first examination of ambulance coded clinical records for suicide ideation and attempt. Sleep disturbances had a unique role in these attendances, over and above common co-occurring factors including drug use and mental health diagnoses.

Prospective association between suicide cognitions and emotional responses to a laboratory stressor: The mediating role of nightly subjective sleep quality

BACKGROUND

Sleep is a reliable correlate of suicidal thoughts and behaviors (STBs), yet few studies have directly examined negative affect in the context of this association. The present study combined daily experience methods with a laboratory paradigm to investigate suicide cognitions as a predictor of emotional responses to environmental stressors, and tested the role of nightly sleep parameters.

METHOD

72 participants (M_age = 24.25; 41 with a recent history of suicide ideation and 31 without a history of STBs) completed a four-day study. Suicide cognitions were measured on the first day, and actigraphy-based sleep duration and fragmentation, and morning ratings of prior night subjective sleep quality (SSQ) were subsequently measured over three consecutive nights. Participants returned on the fourth day to complete the Trier Social Stress Task, where self-report changes in negative affect immediately post-task (i.e., reactivity) and five minutes post-task (i.e., recovery) were observed.

RESULTS

Regression analyses indicated that suicide cognitions predicted negative affect reactivity and recovery. Simple mediation analyses revealed that SSQ partially mediated the relation between suicide cognitions and negative affect recovery (especially shame), but not reactivity. No significant associations were observed for the actigraphy-based sleep parameters.

LIMITATIONS

Just three nights of actigraphy-based data collection. A single item was used to measure SSQ.

CONCLUSIONS

Suicide cognitions predict negative affective responses to situational stressors and SSQ may have a key role in this effect, especially the duration of negative emotional reactions. Hence, sleep and emotional reactivity may be potential targets for suicide prevention efforts.

Sleep Disturbances and Suicidality in Posttraumatic Stress Disorder: An Overview of the Literature

A causal relationship between sleep disturbances and suicidal behavior has been previously reported. Insomnia and nightmares are considered as hallmarks of posttraumatic stress disorder (PTSD). In addition, patients with PTSD have an increased risk for suicidality. The present article gives an overview about the existing literature on the relationship between sleep disturbances and suicidality in the context of PTSD. It aims to demonstrate that diagnosing and treating sleep problems as still underestimated target symptoms may provide preventive strategies with respect to suicidality. However, heterogeneous study designs, different samples and diverse outcome parameters hinder a direct comparison of studies and a causal relationship cannot be shown. More research is necessary to clarify this complex relationship and to tackle the value of treatment of sleep disturbances for suicide prevention in PTSD.

Hazardous drinking and clinical correlates among suicidal patients receiving psychiatric inpatient care at military medical settings

BACKGROUND

To describe prevalence and identify clinical correlates of hazardous drinking among suicidal inpatients at military medical settings.

METHOD

Data were drawn from the baseline assessment of a multisite randomized controlled trial of Post-Admission Cognitive Therapy (PACT). Participants were military Service members or adult beneficiaries (N = 218) who were admitted to inpatient care following a suicide-related crisis. Hazardous alcohol use in the past year was assessed using the Alcohol Use Disorder Identification Test (AUDIT).

RESULTS

The average AUDIT score was 6.78 (SD = 7.87), with 28.9% reporting hazardous drinking (scored ≥8 on the AUDIT). Hazardous drinkers were more likely than nonhazardous drinkers to meet diagnosis of Substance Use Disorder (SUD; Odds Ratio [OR] = 5.96, 95% confidence intervals [CI] = 2.13, 16.71). Hazardous drinking was neither associated with measures of suicide ideation nor aborted or interrupted suicide attempt. However, hazardous drinkers had greater risk of having both single (RRR [Relative Risk Ratio] = 2.55, 95% CI = 1.18, 5.50) and multiple actual suicide attempts (RRR = 2.38, 95% CI = 1.06, 5.32) than nonhazardous drinkers. The association between hazardous drinking and single (but not multiple) actual suicide attempt remained significant after controlling for gender, depressive symptoms, hopelessness, Post-Traumatic Stress Disorder, and SUD (adjusted RRR = 2.48, 95% CI = 1.09, 5.65).

CONCLUSIONS

A history of actual suicide attempt is associated with hazardous alcohol use among suicidal psychiatric inpatients. Assessment of drinking and drug use may inform case conceptualization and treatment of suicide-related behaviors in psychiatric inpatient settings.

Sleep problems and suicide risk in youth: A systematic review, developmental framework, and implications for hospital treatment

OBJECTIVE

Sleep problems are transdiagnostic symptoms that confer significant risk for suicidal thoughts and behaviors (STBs) in adults. However, less is known about the sleep-STB association in adolescence-a developmental period when rates of STBs increase drastically, and sleep problems may be particularly pernicious. This article provides a systematic review of research on the sleep-STB association in youth, an overview of changes in sleep regulation during adolescence that may make sleep problems particularly detrimental for youth, and a discussion of the clinical implications of the sleep-STB association for hospitalized youth.

METHOD

The systematic review included all longitudinal studies in which sleep problems were examined as prospective predictors of STBs in adolescents (aged 10-24 years). The search was conducted on December 1, 2017 using PsychINFO, PubMed, and Web of Science databases.

RESULTS

Ten studies qualified for inclusion in this review. Of these, seven studies found at least one type of sleep problem significantly predicted a STB outcome.

CONCLUSIONS

Although findings are mixed, growing research suggests that sleep problems may be a unique risk factor for STBs in youth. Sleep problems may be particularly important intervention target because they are easily assessed across healthcare settings and are amenable to treatment.

Relationship of Nocturnal Wakefulness to Suicide Risk Across Months and Methods of Suicide

OBJECTIVE

Insomnia is a risk factor for suicide, and the risk of suicide after accounting for population wakefulness is disproportionately highest at night. This study investigated whether this risk varied across months and/or methods of suicide.

METHODS

Time, date, method (eg, firearm, poisoning), and demographic information for 35,338 suicides were collected from the National Violent Death Reporting System for the years 2003-2010. Time of fatal injury was grouped into 1-hour bins and compared to the estimated hourly proportion of the population awake from the American Time Use Survey for 2003-2010. Negative binomial modeling then generated hourly incidence risk ratios (IRRs) of suicide. Risks were then aggregated into 4 categories: morning (6:00 am to 11:59 am), afternoon (noon to 5:59 pm), evening (6:00 pm to 11:59 pm), and night (midnight to 5:59 am).

RESULTS

The risk of suicide was higher at night across all months (P < .001) and methods (P < .001). The mean nocturnal IRR across months was 3.18 (SD = 0.314), with the highest IRR in May (3.90) and the lowest in November (2.74). The mean (SD) nocturnal IRR across methods was 3.09 (0.472), with the highest IRR for fire (3.75) and the lowest for drowning (2.44). Additionally, nocturnal risk was elevated within all demographics (all P < .001). However, there were no month-by-time or method-by-time interactions across demographics (all P > .05).

CONCLUSIONS

Regardless of month or method, the incidence risk of suicide at night is higher than at any other time of day. Additionally, demographic subgroups did not differentially experience higher risks across months or mechanisms at night.

Insomnia Is Associated With Frequency of Suicidal Ideation Independent of Depression: A Replication and Extension of Findings From the National Health and Nutrition Examination Survey

OBJECTIVE

Insomnia is associated with suicidality, although the mechanisms of this association are unclear. This study sought to replicate previous findings showing that insomnia symptoms but not sleep duration are associated with frequency of suicidal ideation in adults. We further investigated whether depression or sleep duration moderates the association between insomnia symptoms and frequency of suicidal ideation.

MATERIALS AND METHODS

We used the 2005-2006 cycle of the National Health and Nutrition Examination Survey to replicate previously reported findings from the 2007-2008 cycle. We used ordered logistic regression to determine whether insomnia symptoms were associated with frequency of suicidal ideation independently of depression and other potential confounds. To extend these findings, we tested whether depression or sleep duration moderated the association between insomnia symptoms and frequency of suicidal ideation. We further replicated these findings in parallel analyses using the combined data from the 2005-2006 and 2007-2008 cycles.

RESULTS

This study replicated previous results showing that insomnia symptoms are associated with frequency of suicidal ideation in the NHANES 2005-2006 cycle (OR = 1.09, p < 0.05), even after adjusting for potentially confounding variables, including depression. Neither depression nor sleep duration moderated this association. Difficulty with sleep maintenance insomnia symptoms were most robustly associated with frequency of suicidal ideation (OR ≥ 1.97, p < 0.05). Sleep duration was not robustly associated with suicidal ideation.

CONCLUSIONS

In this study, we found that insomnia symptoms were uniquely associated with frequency of suicidal ideation. This association cannot be explained by the shared association with depression or sleep duration.

Significant shared heritability underlies suicide attempt and clinically predicted probability of attempting suicide

Suicide accounts for nearly 800,000 deaths per year worldwide with rates of both deaths and attempts rising. Family studies have estimated substantial heritability of suicidal behavior; however, collecting the sample sizes necessary for successful genetic studies has remained a challenge. We utilized two different approaches in independent datasets to characterize the contribution of common genetic variation to suicide attempt. The first is a patient reported suicide attempt phenotype asked as part of an online mental health survey taken by a subset of participants (n = 157,366) in the UK Biobank. After quality control, we leveraged a genotyped set of unrelated, white British ancestry participants including 2433 cases and 334,766 controls that included those that did not participate in the survey or were not explicitly asked about attempting suicide. The second leveraged electronic health record (EHR) data from the Vanderbilt University Medical Center (VUMC, 2.8 million patients, 3250 cases) and machine learning to derive probabilities of attempting suicide in 24,546 genotyped patients. We identified significant and comparable heritability estimates of suicide attempt from both the patient reported phenotype in the UK Biobank (h²_SNP = 0.035, p = 7.12 × 10^-4) and the clinically predicted phenotype from VUMC (h²_SNP = 0.046, p = 1.51 × 10^-2). A significant genetic overlap was demonstrated between the two measures of suicide attempt in these independent samples through polygenic risk score analysis (t = 4.02, p = 5.75 × 10^-5) and genetic correlation (rg = 1.073, SE = 0.36, p = 0.003). Finally, we show significant but incomplete genetic correlation of suicide attempt with insomnia (rg = 0.34-0.81) as well as several psychiatric disorders (rg = 0.26-0.79). This work demonstrates the contribution of common genetic variation to suicide attempt. It points to a genetic underpinning to clinically predicted risk of attempting suicide that is similar to the genetic profile from a patient reported outcome. Lastly, it presents an approach for using EHR data and clinical prediction to generate quantitative measures from binary phenotypes that can improve power for genetic studies.

Profiles of Risk for Suicidal Behavior in Past and Current United States Military Personnel: Latent Profile Analysis of Current Risk Factors

Person-centered approaches are underutilized to identify people with shared risk profiles. In this study, an at-risk sample of 773 past/current military personnel (Mage = 31.3 years, SD = 6.8) with current ideation (90.6%) and/or a prior suicide attempt (43.9%) were assessed using latent profile analysis. Variables included prior suicide attempts, suicidal ideation, alcohol/drug use, insomnia, depression, belongingness, burdensomeness, and post-traumatic stress disorder symptoms. Three classes emerged: Low Symptoms (N = 502), Elevated Suicidality (N = 176), and Elevated Substance Use (N = 95). At 1-month follow-up, the Elevated Suicidality and Elevated Substance Use classes had the highest odds of suicidal behavior. The finding concerning the Elevated Substance Use class suggests it may represent a distinct short-term risk group in military personnel.

Gender Differences in the Relationship Between Sleep Problems and Suicide Attempt in Adolescents

There are few studies examining which types of sleep problems are independently associated with suicide attempt (SA) and gender difference in adolescents. The aim of the present study was to examine whether specific sleep problems were uniquely associated with suicide attempt in adolescents and explore gender differences in the association. A school-based health survey was conducted in four provinces within China from November 2014 to January 2015. A total of 15,132 students aged 10-21 years completed standard questionnaires assessing past 12 month suicide attempt in addition to measures of sleep quality, quantity and sleep beliefs. 5.4% of participants reported a suicide attempt within the last 12 months. After adjustment for sociodemographic variables and psychological symptoms, almost all sleep problems remained significantly associated with a greater endorsement of suicide attempt. Further adjustment for co-occurring sleep problems revealed that weekday sleep duration (<6, 8-10, and ≥10 h), insomnia (often), and nightmares (sometimes and often) remained independently associated with suicide attempt in boys (p < 0.05). However in girls, weekday sleep duration (<6 and ≥10 h), weekend sleep duration (<6 h), midday nap (0 or 1-2 d/week), insomnia (sometimes and often), nightmare (often) and sleep beliefs (high) were independently associated with suicide attempt (p < 0.05). Multiple sleep problems are associated with suicide attempt in adolescents, however the relationship varies by gender.

Pre-deployment insomnia is associated with post-deployment post-traumatic stress disorder and suicidal ideation in US Army soldiers

Study Objectives

Insomnia is prevalent among military personnel and may increase risk of mental disorders and suicidal ideation. This study examined associations of pre-deployment insomnia with post-deployment post-traumatic stress disorder (PTSD) and suicidal ideation among US Army soldiers.

Methods

Soldiers from three Brigade Combat Teams completed surveys 1-2 months before deploying to Afghanistan in 2012 (T0), on return from deployment (T1), 3 months later (T2), and 9 months later (T3). Logistic regression was performed to estimate associations of pre-deployment (T0) insomnia with post-deployment (T2 or T3) PTSD and suicidal ideation among respondents who completed surveys at all waves (n = 4645). A hierarchy of models incorporated, increasing controls for pre-deployment risk factors and deployment experiences.

Results

Pre-deployment insomnia was associated with increased risk of post-deployment PTSD (adjusted odds ratio [AOR] = 3.14, 95% confidence interval [CI] = 2.58% to 3.82%, p < .0005) and suicidal ideation (AOR = 2.78, 95% CI = 2.07% to 3.74%, p < .0005) in models adjusting for sociodemographic characteristics and prior deployment history. Adjustment for other pre-deployment risk factors and deployment experiences attenuated these associations; however, insomnia remained significantly associated with post-deployment PTSD (AOR = 1.50, 95% CI = 1.19% to 1.89%, p = .001) and suicidal ideation (AOR = 1.43, 95% CI = 1.04% to 1.95%, p = .027). Subgroup models showed that pre-deployment insomnia was associated with incident PTSD (AOR = 1.55, 95% CI = 1.17% to 2.07%, p = .003) and suicidal ideation (AOR = 1.67, 95% CI = 1.16% to 2.40%, p = .006) among soldiers with no pre-deployment history of these problems.

Conclusions

Pre-deployment insomnia contributed to prediction of post-deployment PTSD and suicidal ideation in Army soldiers, suggesting that detection of insomnia could facilitate targeting of risk mitigation programs. Future studies should investigate whether treatment of insomnia helps prevent PTSD and suicidal ideation among deployed service members.

Suicide risk around the world: a meta-analysis of longitudinal studies

PURPOSE

Suicidal thoughts and behaviors (STBs) have been a persistent problem worldwide. Identifying risk factors for STBs across distinct areas of the world may help predict who or where requires the greatest attention. However, risk factors for STBs are infrequently explored cross-nationally. The present study examined whether psychopathology prospectively predicts STBs across different areas of the world, and whether certain country-level factors moderate the degree of risk conferred.

METHODS

We conducted a meta-analysis of 71 longitudinal studies from 30 different countries that featured psychopathology-related variables predicting STB outcomes. Meta-regression was used to evaluate whether the following country-level factors modified risk: geographic region, income level, and degree of mental health structural stigma.

RESULTS

Over 90% of studies had been conducted in North America and Europe. When assessed by country income level, it was found that only one longitudinal study on psychopathology and STB was conducted outside of a high-income country. Moreover, less than 10% of studies were conducted in high structural stigma contexts. Meta-regression findings revealed that the variation in risk effect sizes across studies was not explained by models including country-level factors.

CONCLUSIONS

Our findings show critical underrepresentation of low- and middle-income countries, which account for a large proportion of global suicide deaths. This reveals a need to broaden the scope of longitudinal research on STB risk, such that countries across more regions, income levels, and degrees of structural stigma are fully accounted for. Such lines of research will improve generalizability of findings, and more precisely inform prevention efforts worldwide.

Longitudinal course of suicidal ideation and predictors of its persistence - A NESDA study

BACKGROUND

Prior research indicates that the factors that trigger suicidal ideation may differ from those that maintain it, but studies into the maintenance of suicidal ideation remain scarce. Our aim was to assess the longitudinal course of suicidal ideation, and to identify predictors of persistent suicidal ideation.

METHODS

We used data from the Netherlands Study of Depression and Anxiety (NESDA). We performed a linear mixed-effects growth model analysis (n = 230 with current suicidal ideation at baseline) to assess the course of suicidal ideation over time (baseline through 2-, 4-, 6- and 9-year follow-up). We used logistic regression analysis (n = 195) to test whether factors previously associated with the incidence of suicidal ideation in the literature (insomnia, hopelessness, loneliness, borderline personality traits, childhood trauma, negative life events) also predict persistence of suicidal ideation (i.e., reporting ideation at two consecutive assessment points, 6- and 9-years). We controlled for socio-demographics, clinical diagnosis and severity, medication use, and suicide attempt history.

RESULTS

Suicidal ideation decreased over time, and this decrease became slower with increasing time, with the majority of symptom reductions occurring in the first two years of follow-up. More severe insomnia and hopelessness were associated with increased odds of persistent suicidal ideation, and hopelessness was a significant mediator of the relationship between insomnia and persistent suicidal ideation.

LIMITATIONS

Findings may not generalize to those with more severe suicidal ideation due to dropout of those with the worst clinical profile.

CONCLUSIONS

Targeting insomnia and hopelessness in treatment may be particularly important to prevent the persistence of suicidal ideation.

Demographic and Clinical Characteristics of Military Service Members Hospitalized Following a Suicide Attempt versus Suicide Ideation

Psychiatric hospitalization for a suicide attempt (SA), rather than suicide ideation (SI) alone, is a stronger risk indicator for eventual suicide death. Yet, little is known about demographic and clinical characteristics differentiating those admitted for SA versus SI. Understanding these differences has implications for assessment and treatment. A retrospective review of electronic medical records (EMRs) was performed on service members (n = 955) admitted for SA or SI at the Walter Reed Army Medical Center between 2001-2006. Service members hospitalized for SA were younger compared to those hospitalized for SI. The proportion of women admitted for SA was significantly higher than those admitted for SI whereas their male counterparts showed the opposite pattern. Patients admitted for SA, versus SI, had significantly higher prevalence of adjustment disorder with mixed disturbance of emotion and conduct (MDEC), personality disorder not otherwise specified (PDNOS), and borderline personality disorder (BPD). Patients admitted for SI had significantly higher prevalence of adjustment disorder with depressed mood and deferred Axis II diagnosis, compared to those admitted for SA. There were no significant between-group differences in the average or median number of documented prior suicide attempts. Findings highlight the need for more standardized assessment, diagnostic decision-making, and documentation practices for all patients.

The impact of exposure, relaxation, and rescripting therapy for post-trauma nightmares on suicidal ideation

OBJECTIVE

This study investigated whether a brief psychotherapy for post-trauma nightmares (exposure, relaxation, and rescripting therapy [ERRT]), reduced suicidal ideation (SI). We hypothesized that: (a) nightmare frequency and severity, post-traumatic stress disorder (PTSD), depression, and sleep quality would be related to SI at pretreatment; (b) SI would decrease from pre- to post-treatment; and (c) the decrease in SI would remain after controlling for change in PTSD and depression.

METHOD

Seventy-five individuals exposed to a traumatic event and who experienced frequent nightmares (minimum one per week) participated in ERRT. Participants were not required to have a psychological diagnosis. Thirty percent endorsed SI at pretreatment.

RESULTS

Depression and PTSD were related to SI at pretreatment. SI decreased following treatment; however, the third hypothesis was not supported.

CONCLUSION

Results suggest brief psychotherapy targeting post-trauma nightmares may decrease SI. More research is necessary to determine what factors contribute to decreases in SI.

Sleep problems and functioning during initial training for a high-risk occupation

OBJECTIVES

The current study sought to characterize the sleep problems of soldiers entering Basic Combat Training and to identify the link between sleep problems and subsequent performance, psychological distress, anger reactions, and attention.

DESIGN

Soldiers were surveyed at 4 time points throughout the standard 10 weeks of Basic Combat Training. Surveys were administered at weeks 1, 3, 6, and 9. Sleep problems were identified as either present or absent at each time point using a sleep problem screening questionnaire. Four sleep patterns were identified and then used to evaluate outcomes throughout training (n = 1577).

RESULTS

When compared to those who never had a sleep problem ("healthy "; 60.6%), those who recovered from their initial sleep problem ("recovered"; 12.8%) started training with higher psychological distress and anger reactions and lower attention but steadily improved throughout training. Those who developed a sleep problem during training ("new onset"; 20.0%) and those who had a sleep problem throughout training ("chronic"; 6.6%) also started off significantly worse than the healthy group. The new-onset and chronic groups saw slower psychological distress improvement and a decline in attention throughout the course compared to the healthy group. The chronic group also significantly increased their anger reactions throughout training compared to the healthy group.

CONCLUSION

Sleep problems during Basic Combat Training may be an indicator for difficulties managing entry into the military. These findings highlight the importance of improving sleep health for soldiers throughout Basic Combat Training and for others with similar training in high-risk occupations.

Refining Psychological, Substance Use, and Sociodemographic Predictors of Suicide Ideation and Attempts in a National Multiethnic Sample of Adults, 2008-2013

The purpose of this study was to examine psychological, substance use, and sociodemographic predictors of 12-month suicide ideation and attempts across six US racial/ethnic groups-white, Latino/a, Black, Asian or Pacific Islander (A/PI), American Indian or Alaska Native (AI/AN), and multiracial adults. Multiple logistic regression analyses were conducted for 218,765 adults who participated in the 2008-2013 National Survey on Drug Use and Health. Overall, commonly cited factors were associated with increased risk for suicide ideation and attempt for some racial/ethnic groups, but not for others. As one example, 12-month depression was associated with 12-month suicide attempt for A/PI, AI/AN, Latino/a, and white, but not for Black or multiracial adults. Alcohol abuse and dependence were also associated with suicide attempt for AI/AN, Black, and white respondents but not for other racial/ethnic groups. Risk factors for suicide ideation and attempt may not increase risk universally. More theoretically supported research is needed.

Sleep, suicide behaviors, and the protective role of sleep medicine

OBJECTIVE/BACKGROUND

Sleep disturbance is associated with suicidal thoughts and behaviors. The relationship of specific sleep disorders to suicide attempts is less well established. Whether treating sleep disorders reduces suicide attempts remains controversial.

METHODS

Suicide attempts, treatment utilization, and psychiatric diagnoses were extracted from electronic medical records and a suicide attempt database from the U.S. Department of Veterans Affairs. The sample (N = 60,102) consisted of patients with any record of suicide attempt in FY13-14 and a 1:1 case-control of patients with no record of attempt, who were propensity score-matched based on age, gender, and prior year mental health treatment utilization. Associations among sleep disorders and suicide attempt were examined via logistic regression. Covariates included depression, anxiety, posttraumatic stress disorder (PTSD), bipolar, schizophrenia, substance use disorder (SUD), medical comorbidity, and obesity.

RESULTS

Insomnia (OR = 5.62; 95% CI, 5.39-5.86), nightmares (odds ratio, OR = 2.49; 95% confidence interval, CI, 2.23-2.77), and sleep-related breathing disorders (OR = 1.37; 95% CI, 1.27-1.48) were positively associated with suicide attempt after accounting for age, gender, treatment utilization, and comorbid sleep disorders. Furthermore, when controlling for depression, anxiety, PTSD, bipolar, schizophrenia, substance use disorder (SUD), medical comorbidity, and obesity, insomnia (OR = 1.51, 95% CI, 1.43-1.59) remained positively associated with suicide attempt nightmares (OR = 0.96; 95% CI, 0.85-1.09) nor sleep-related breathing disorders (OR = 0.87, 95% CI = 0.79-0.94). Additionally, sleep medicine visits 180 days prior to index date were associated with decreased likelihood of suicide attempt for individuals with sleep disorders (OR = 0.86; 95% CI, 0.79-0.94).

CONCLUSION

Insomnia is associated with suicide attempt among veterans. Sleep medicine visits were associated with a reduced risk of suicide attempt in sleep disordered patients. The assessment and treatment of sleep disorders should be considered in context of strategies to augment suicide prevention efforts.

The Relationship between Suicidal Responses and Traumatic Brain Injury and Severe Insomnia in Active Duty, Veteran, and Civilian Populations

This study examined how a positive traumatic brain injury (TBI) screening and insomnia severity relate to suicidal outcomes across active duty, veteran, and civilian samples. Data were used from 3,993 participants from 19 studies. We conducted a series of analyses by group to identify which significantly differed on the variables of interest. TBI and insomnia each had independent relationships with outcomes over and above the impact of the other factor. Veterans presented as clinically worse across the outcomes. However, the relationship between insomnia and suicidal responses was stronger for active duty military compared to veterans. Continued research on TBIs and insomnia severity across groups will improve quality of care for those at risk of suicide.

The prevalence and clinical risk factors of insomnia in the Chinese elderly based on comprehensive geriatric assessment in Chongqing population

BACKGROUND

Insomnia is a major public health problem affecting older people. This study aimed to investigate the prevalence and clinical risk factors of insomnia in a representative sample of Chinese elderly (≥ 60 years) in Chongqing.

METHODS

A cross-sectional study based on comprehensive geriatric assessment was conducted from January 2013 to February 2014. A questionnaire on sleep status was provided to each patient and insomnia was assessed according to the Diagnostic and Statistical Manual of Mental Disorders 4th edition criteria. A multivariate logistic regression model was used to illustrate risk factors correlated with insomnia.

RESULTS

Of the total 597 participants, 55.4% suffered from insomnia. The prevalence of insomnia in men and women was 48.2% and 63.2%, respectively. Coronary heart disease, dizziness, chronic pain, anorexia, malnutrition, depression and cognitive decline were identified as risk factors associated with insomnia. Hypertension, diabetes, hyperlipidaemia, headache, age and education level were not observed to be significantly associated with insomnia.

CONCLUSIONS

Insomnia is highly prevalent among the elderly in Chongqing, and shows a positive correlation to coronary heart disease, dizziness, chronic pain, anorexia, malnutrition, depression, cognitive impairment. Moreover, women are more likely to experience insomnia than men.

Sleep and timing of death by suicide among U.S. Veterans 2006–2015: analysis of the American Time Use Survey and the National Violent Death Reporting System

Study Objectives

Suicide is a top public health priority, and U.S. Veterans are recognized to be at particularly elevated risk. Sleep disturbances are an independent risk factor for suicide; recent empirical data suggest that nocturnal wakefulness may be a key mechanism underlying this association. Given higher rates of sleep disturbances among U.S. Veterans compared with civilians, we examined associations between nocturnal wakefulness and timing of death by suicide in U.S. Veterans and civilians to determine whether temporal suicide patterns differed.

Methods

The American Time Use Survey and the National Violent Death Reporting System were analyzed (2006–2015) to determine whether sleep and temporal suicide patterns differed between age-stratified groups (18–39, 40–64, and ≥65) of U.S. Veterans and civilians. Observed temporal suicide patterns were reported and standardized incidence ratios (SIRs) calculated to compare the percentage of suicides observed with those expected, given the proportion of the population awake, across clock hours.

Results

The raw proportion of Veteran suicides peaks between the hours of 1000–1200; however, the peak prevalence of suicide after accounting for the population awake is between 0000 and 0300 hr (p < .00001, ϕ = .88). The highest SIR was at midnight; U.S. Veterans were eight times more likely to die by suicide than expected given the population awake (SIR = 8.17; 95% CI = 7.45–8.94).

Conclusions

Nocturnal wakefulness is associated with increased risk for suicide in U.S. Veterans. Overall patterns of observed suicides by clock hour were similar between U.S. Veterans and civilians. However, Veteran-specific SIRs suggest differences in magnitude of risk by clock hour across age groups. Future research examining female and Post-9/11 U.S. Veterans is warranted.

School environment, physical activity, and sleep as predictors of suicidal ideation in adolescents: Evidence from a national survey

INTRODUCTION

Suicide is the second leading cause of death among individuals between 10 and 34 years of age and suicidal ideation substantially increases during adolescence. The purpose of this study was to examine the associations among physical activity, sleep, and factors relating to the school environment with adolescent self-reported rates of suicidal ideation on the 2017 National Risk Behavior Survey (YRBS).

METHODS

A multi-stage cluster sampling procedure was employed to yield a representative sample of US adolescents recruited from the 9th through 12th grade. The number of sampled adolescents was 18,324 with 10,125 students submitting questionnaires with useable data for this study. Weighted logistic regression models were employed to examine the predictive utility of physical activity, sleep, and factors related to the school environment with suicidal ideation, adjusting for age, sex, and BMI percentile.

RESULTS

Meeting physical activity guidelines every day of the week (OR 0.62, 95% CI: 0.51-0.76), hours of sleep (OR 5.46, 95% CI: 4.21-7.09), and factors relating to the school environment including bringing weapons to school (OR 2.06, 95% CI: 1.24-3.41), perceived school safety (OR 1.59, 95% CI: 1.27-2.00), and being bullied (OR 3.23, 95% CI: 2.71-3.87) and buying illegal drugs at school (OR 1.92, 95% CI: 1.63-2.27) all significantly independently predicted suicidal ideation.

CONCLUSIONS

Physical activity, sleep, and the school environment significantly predict suicidal ideation among this national sample of adolescents. These factors should be considered when designing interventions or programs to reduce the risk of suicidal ideation among adolescents.

Heterogeneity in Short-Term Suicidal Ideation Trajectories: Predictors of and Projections to Suicidal Behavior

OBJECTIVE

Little is known about suicidal ideation stability, including whether stability is heterogeneous or homogeneous between individuals. Studies of this kind are necessary to understand the progression from suicidal ideation to action.

METHOD

This study examined suicidal ideation trajectories, using growth mixture modeling, in a sample of 359 past/current military service members (M age = 32.1 years, SD = 7.7; 88.3% male). Self-reported suicidal ideation information was collected at baseline and follow-up sessions at months 1, 3, 6, and 12. Following extraction of the best-fitting solution, predictors of trajectory status were examined and trajectory status was used to predict suicidal behavior between baseline and month 12 assessments.

RESULTS

Results revealed four trajectories, Low-Stable (n = 125), Moderate-Stable (n = 101), High-Stable (n = 76), and High-Rapidly Declining (n = 57). In general, the High-Stable trajectory had the highest levels of perceived burdensomeness, thwarted belongingness, PTSD symptoms, and drug use. The High- and Moderate-Stable trajectories had the highest rates of suicidal behavior between baseline and month 12.

CONCLUSIONS

Suicidal ideation, even in individuals with elevated ideation, is not a homogeneous construct over time. Stability of suicidal ideation might be an important risk factor, even if ideation is only moderately elevated.

Assessing interpersonal and mood factors to predict trajectories of suicidal ideation within an inpatient setting

BACKGROUND

A limited amount of research has assessed how suicide risk changes over time, and how changes can be predicted. The current study assessed suicidal ideation and risk factors throughout inpatient visits to a psychiatric facility to refine prediction of suicide risk.

METHOD

In total, 491 patients (73% Female; mean age = 39.21) at a psychiatric inpatient facility self-reported the frequency of their suicidal thoughts, perceived burdensomeness, thwarted belongingness, hopelessness, depression, and anxiety in the prior 24 h on a daily basis. Levels of suicidal ideation and risk factors at each quarter of an inpatient's stay were identified, and latent class growth analysis used to identify common patterns of change over time.

RESULTS

Changes in mood and interpersonal factors were associated with changes in suicidal ideation over days and weeks. Further, they contributed to the prediction of future levels of suicidal ideation. Thwarted belongingness at admission predicted whether patients had pervasively high suicidal thoughts over the course of inpatient visits or showed marked improvements, while perceived burdensomeness predicted which patients would develop suicidal thoughts during their visit.

LIMITATIONS

The use of single item measures may limit specificity of measurement of suicide risk factors. Hourly, rather than daily measurement used in the current study, may more accurately identify suicide risk.

CONCLUSIONS

Change in suicidal ideation is associated with changes in a number of psychological risk factors. Regular assessment of interpersonal risk factors may identify warning signs and aid clinical interventions in reducing suicidal thoughts and associated self-injurious behaviours.

Sleep-related problems and suicide behavior and ideation among Black and White trauma-exposed psychiatric inpatients

OBJECTIVE

Sleep-related problems (SRPs) are associated with increased risk for suicide-related behavior and death. Given that Black adults report greater SRPs as compared to White adults, the purpose of the current study was to examine sleep problems, suicide-related psychiatric admission, and suicide ideation, in Black and White trauma-exposed adults.

METHOD

Suicide-related behavior (i.e., intent, plan, and/or behavior) as reason for hospital admission was obtained via medical records review for 172 Black and White adults who were admitted to an acute-care psychiatric facility; all participants completed validated measures of sleep quality and suicide ideation.

RESULTS

Adjusted logistic regression analyses revealed that sleep-related daytime dysfunction (AOR = 4.32, p < .05) and poor sleep quality (AOR = 3.64, p < .05) were associated with significantly increased odds that Black participants were admitted for suicide-related psychiatric care. Poorer sleep quality (AOR = 2.10, p < .05) was also associated with increased odds of suicide-related admission among White participants. However, shorter sleep duration was marginally associated with suicide ideation in Black participants only.

CONCLUSIONS

SRPs may be related to suicide-related behavior and ideation differently for vulnerable Black and White adults. More research is needed to understand potential race group differences and mechanisms by which SRPs increase risk for suicide crisis across racial groups.

Investigating the reliability of suicide attempt history reporting across five measures: A study of US military service members at risk of suicide

OBJECTIVE

Utilizing a sample of military service members at risk of suicide, this study aimed to: (a) identify patterns of suicide attempt (SA) history reporting across five measures and (b) evaluate whether consistent SA reporters (i.e., individuals who consistently report an SA history across measures) differ from inconsistent SA reporters on other clinical severity indices.

METHOD

Participants (N = 984) completed five validated SA history measures and self-report psychiatric symptom measures.

RESULTS

Of the sample, 35.4% inconsistently responded to SA history measures. Inconsistent reporters disclosed more severe suicide threat histories than consistent reporters. On all other clinical severity indices, inconsistent reporters evinced either less severe or comparable symptom levels.

CONCLUSIONS

A nontrivial portion of service members may respond inconsistently to different assessments of SA history. Research is needed to identify factors that account for inconsistent SA history reporting and to improve the accuracy of SA history assessments among military personnel.

An examination of PTSD symptoms and their effects on suicidal ideation and behavior in non-treatment seeking veterans

This study sought to examine the effect of general PTSD symptoms as well as specific PTSD symptom clusters on suicidal ideation and suicidal attempts. We first compared a correlated factors solution consistent with the DSM-5 symptom clusters for PTSD with a bifactor solution comprising a General PTSD factor and orthogonal specific factors. Using the best fitting model (i.e., bifactor solution), we then investigated the effect of specific PTSD symptom clusters on severity of suicidal ideation and suicide attempts above and beyond the effect of general PTSD symptoms. A sample of 773 veterans who have never sought professional mental health treatment were screened for suicidal ideation within the past two weeks. One month after the baseline measurement, the participants completed a follow-up assessment, again by telephone. A bi-factor solution was used to account for a general PTSD factor as well as the specific DSM-5 PTSD symptom clusters. After controlling for baseline suicidal ideation and behavior, it appeared that the Anxious Arousal factor was predictive of changes in the magnitude of severity of suicidal ideation and the General PTSD factor was predictive of the onset of new suicidal behavior at the one-month follow-up. Additionally, the Re-experiencing factor of PTSD also significantly predicted new suicidal behavior at the one-month follow-up. These results suggest that it may beneficial for clinicians, who are assessing individuals with PTSD for suicidality, to be aware of the frequency, duration, and content of their clients' repetitive, intrusive thoughts as these thoughts may increase their capability to inflict non-lethal or lethal forms of self-injury.

Predicting Suicide Ideation in the Military: The Independent Role of Aggression

The purpose of this study was to examine the longitudinal relationship between aggression and suicide ideation when controlling for other externalizing (i.e., alcohol misuse and risk-taking) and internalizing (i.e., depression and sleep problems) risk factors in an active duty, military sample. Preexisting data from a longitudinal study were analyzed to assess the wellness of service members across the deployment cycle. Participants were 944 active duty service members (95% male, 48% between 18 and 24 years old) who completed surveys upon initial return from deployment and approximately 3 months later. After controlling for other externalizing (alcohol misuse, risk-taking) and internalizing (depression, sleep problems) risk factors, service members reporting aggression were significantly more likely to report suicide ideation than those reporting no aggression (OR = 3.19; OR 95% CI: 1.16-8.80). The independent nature of the relationship between anger and suicidality suggests aggression may be an important indicator of suicidality for service members. Understanding the role of aggression in suicidality may improve the ability to identify at-risk service members and to develop effective interventions to reduce suicide risk.

Delivering Cognitive Behavioral Therapy for Insomnia in Military Personnel and Veterans

Insomnia is commonly reported by military populations, especially those with comorbid mental and physical health conditions. Co-occurring conditions result in an altered presentation of insomnia symptoms, and complicate provision of cognitive-behavioral therapy for insomnia (CBT-I), requiring supplementary assessment or modifications to traditional techniques. CBT-I has consistently demonstrated positive outcomes for active-duty service members and veterans, even in the context of significant comorbidities such as post-traumatic stress disorder, depression, sleep apnea, and chronic pain. Despite its promise, studies of CBT-I in some populations, including women and individuals with substance use disorders, remain relatively understudied in active-duty and veteran populations.

Insomnia and risk for suicidal behavior: A test of a mechanistic transdiagnostic model in veterans

BACKGROUND

Insomnia has been shown to have direct and indirect associations with suicidal ideation, attempts, and death in U.S. military and veteran populations. However, transdiagnostic models of insomnia and psychopathology have not been used to examine the contribution of psychopathology.

METHOD

The present study is a secondary analysis examining the associations among insomnia symptoms, posttraumatic stress disorder (PTSD) and depressive symptoms, interpersonal theory of suicide variables, and risk for suicidal behavior in community veterans (n = 392). Serial mediation was used to test sequential associations, allowing for examination of direct and indirect associations.

RESULTS

The model with insomnia, PTSD, and depressive symptoms, and thwarted belongingness, accounted for 29% of the variance in risk. Insomnia symptoms had an indirect association through PTSD and depressive symptoms, and thwarted belongingness. The model with insomnia, PTSD, and depressive symptoms, and perceived burdensomeness accounted for 35% of the variance in risk. Insomnia symptoms had an indirect association through PTSD and depressive symptoms, and perceived burdensomeness.

LIMITATIONS

Data are cross-sectional, precluding the testing of causal associations.

CONCLUSIONS

In veterans, insomnia symptoms may be associated with increased PTSD and depressive symptoms, which may be associated with increased risk for suicidal behavior directly and indirectly through relationship disruptions.

Short sleep duration and poor sleep quality predict next-day suicidal ideation: an ecological momentary assessment study

BACKGROUND

Sleep problems are a modifiable risk factor for suicidal thoughts and behaviors. Yet, sparse research has examined temporal relationships between sleep disturbance, suicidal ideation, and psychological factors implicated in suicide, such as entrapment. This is the first in-the-moment investigation of relationships between suicidal ideation, objective and subjective sleep parameters, and perceptions of entrapment.

METHODS

Fifty-one participants with current suicidal ideation completed week-long ecological momentary assessments. An actigraph watch was worn for the duration of the study, which monitored total sleep time, sleep efficiency, and sleep latency. Daily sleep diaries captured subjective ratings of the same sleep parameters, with the addition of sleep quality. Suicidal ideation and entrapment were measured at six quasi-random time points each day. Multi-level random intercept models and moderation analyses were conducted to examine the links between sleep, entrapment, and suicidal ideation, adjusting for anxiety and depression severity.

RESULTS

Analyses revealed a unidirectional relationship whereby short sleep duration (both objective and subjective measures), and poor sleep quality, predicted the higher severity of next-day suicidal ideation. However, there was no significant association between daytime suicidal ideation and sleep the following night. Sleep quality moderated the relationship between pre-sleep entrapment and awakening levels of suicidal ideation.

CONCLUSIONS

This is the first study to report night-to-day relationships between sleep disturbance, suicidal ideation, and entrapment. Findings suggest that sleep quality may alter the strength of the relationship between pre-sleep entrapment and awakening suicidal ideation. Clinically, results underscore the importance of assessing and treating sleep disturbance when working with those experiencing suicidal ideation.