Self-reported Insomnia Research Articles

An Emerging 21st-Century Midlife Sleep Crisis? Cohort Differences in Sleeping Patterns Among Americans in Midlife and Older Adulthood.

To descriptively document birth cohort differences in sleeping patterns, self-reported age-specific sleep duration, and insomnia symptoms among adults aged 50+ from the National Health Interview Survey (NHIS) and the Health and Retirement Study (HRS). We analyzed respondents aged 50+ (born 1920-1969) from the 2006-2018 NHIS (n = 162,400) and HRS (n = 28,918). We fit multinomial models among the NHIS sample predicting age-specific optimal sleep duration (optimal for age vs short for age, and optimal for age vs long for age). For the HRS sample, we fit growth curve models predicting age-based insomnia symptom trajectories. The models for both samples adjusted for age, gender, race/ethnicity, and educational attainment. Results regarding sleep duration in the NHIS, suggested that cohorts born in the 1950s and 1960s had significantly higher odds of reporting short sleep duration than cohorts before them. Results from the HRS similarly illustrated that cohorts born in the 1950s and 1960s had significantly higher levels of insomnia symptoms than those born before them. The worsening sleep among cohorts entering midlife was consistent regardless of alternative cohort specification, when age groups or periods were analyzed, and when more extensive covariates were modeled. We observe a pronounced decline in healthy sleeping patterns among American cohorts in midlife, with consistent and striking results across data sets, methods, and measures. These findings have important implications for the well-being and longevity of Americans who have entered midlife in the 21st century.

Validity and Reliability of the Turkish Version of the Sleep Condition Indicator: A Clinical Screening Instrument Based on the DSM-5 Criteria for Insomnia.

We aimed to adapt the Turkish Sleep Condition Indicator (SCI) version and examine its psychometric properties among the general population. This study was a cross-sectional study. The item-total correlation, standard error of measurement, Cronbach's α, and McDonald's ω were used for internal consistency. We ran confirmatory factor analysis (CFA) and network analysis to confirm the factor structure. Multigroup CFA was run to assess the measurement invariance across gender, whether clinical insomnia or not, and poor sleep quality. We correlated SCI scores with Insomnia Severity Index (ISI) and Pittsburgh Sleep Quality Index (PSQI) scores to evaluate construct validity. A receiver operating characteristic (ROC) curve analysis was conducted to calculate the cut-off score of the SCI. The temporal stability was examined with the intraclass correlation coefficient. Eight hundred thirty-four participants attended. Over half of the participants were women (63.2% n = 527); the mean age was 36.15 ± 9.64. Confirmatory factor and network analysis results show that the two-factor correlated model had a good model fit for the SCI. The SCI had scalar level invariance across gender, having clinical insomnia and poor sleep quality in the Multigroup CFA. ROC curve analysis shows that the SCI has good sensitivity (90.3%) and specificity (91.8%) for cut-off ≤ 15. The intraclass correlation coefficient computed between the first and second SCI total scores was significant (r=0.80 with a 95% confidence interval from 0.78 to 0.87; p < 0.001). The Turkish SCI is a practical self-reported insomnia scale with good psychometric properties that can be used to screen for insomnia disorder.

Telehealth delivery of adapted CBT-I for insomnia in chronic pain patients: a single arm feasibility study.

A large proportion of individuals with chronic pain experience insomnia-related symptoms which can be persistent in nature, and negatively impact one's quality of life. This single arm trial aimed to investigate the feasibility and preliminary efficacy of CBT-I, adapted for people with chronic musculoskeletal pain, delivered via telehealth. We conducted a single arm feasibility trial in which 10 adult women (M age = 50.76 years, SD = 8.03 years) with self-reported insomnia and a diagnosed chronic musculoskeletal chronic pain received six CBT-I individual treatment sessions over 6-10 weeks. Treatment was delivered via telehealth. Participants completed weekly sleep diaries, and self-reported measures of insomnia, pain, anxiety and depression pre-treatment, post-treatment, and one-month follow-up. The trial yielded, high levels of compliance with intervention protocols, and affirmative feedback on satisfaction which demonstrated feasibility. The enrolment rate into the study was 37% (27 participants screened, 10 participants enrolled). The intervention was associated with statistically and clinically meaningful improvements in self-reported insomnia severity. There were statistically significant improvements in sleep efficiency, wake after sleep onset, sleep onset latency, anxiety and depression. Adapted CBT-I delivered via telehealth may be a feasible, acceptable, and efficacious therapeutic approach for individuals with co-existent sleep and chronic pain. Future trials should adopt a randomized design against usual care.

Changes in sleep effort mediate insomnia severity in older adults following online cognitive behavioural therapy.

To examine treatment mechanisms of digitally delivered cognitive behavioural therapy for insomnia (CBT-I), this study assessed the mediating effects of dysfunctional beliefs, hyperarousal, locus of control, self-efficacy, sleep effort, and safety behaviours on self-reported insomnia severity in older adults before and following the completion of a self-guided, online CBT-I program. The baseline and follow-up measurements were completed by 62 older adults (55 female, 89%). This was a two-condition within-participant design. Mediation analysis using a parallel mediation model was conducted using the MEMORE macro for repeated measure designs. Out of all the included mediator variables, only a reduction in sleep effort scores (0.88; SE 0.51; 95% CI 0.001-2.00) significantly mediated changes in insomnia severity scores following the intervention. Insomnia severity scores significantly reduced following the intervention (Mpre = 9.84, SD = 5.89, Mpost = 6.87, SD = 4.90); t(61) = 5.19, P = <0.001; d = 0.55 95% CI 0.38-0.93. Sleep in older adults improved following digitally delivered CBT-I, and these changes were influenced by a reduction in sleep control efforts exerted by participants. These findings highlight possible treatment pathways of CBT-I. Further investigation of CBT-I as a strategy to prevent sleep problems is warranted. Australian New Zealand Clinical Trials Registry (ANZCTR), ACTRN 12619001509156; http://www.anzctr.org.au/Trial/Registration/TrialReview.aspx?id=378451.

Changes of adolescent sleep patterns during the COVID-19 pandemic.

The COVID-19 pandemic has raised numerous concerns regarding its effects on individuals' health and lifestyle. We aim to analyze potential changes in adolescent sleep patterns from before and during the pandemic and identify specific predictors of changes. A subgroup of adolescents from a population-based birth cohort from Pelotas, Brazil, was assessed pre-pandemic (T1, November-2019 to March-2020) and peri-pandemic (T2, August-2021 to December-2021) in in-person interviews (n = 1,949). Sleep parameters, including sleep duration and latency time on workdays and free days, as well as social jetlag (SJL), were assessed using the Munich ChronoType Questionnaire (MCTQ). Socio-demographic, pre-pandemic, and pandemic-related predictors were analyzed. Changes in sleep parameters from T1 to T2 were estimated by multivariate latent change score modeling. The latent change factor shows a significant mean increase in workday sleep duration (M = 0.334, p < 0.001), workday sleep latency (M = 0.029, p = 0.002), and free day sleep latency (M = 0.021, p = 0.034), and a decreased in SJL (M = -0.758, p < 0.001) during the pandemic. Female adolescents presented higher increases in workday sleep duration. Adolescents who adopted a stricter social distancing level during the pandemic presented greater increases in workday sleep duration and smaller reductions in SJL. Self-evaluated insomnia during the pandemic predicted lower increases in workday and free day sleep duration and higher increases in workday and free day sleep latency. The COVID-19 outbreak brought certain advantages regarding increased sleep duration and reduced SJL. However, the observed increase in sleep latency and the influence of self-reported insomnia could be related to psychological distress inherent to the pandemic.

Effectiveness of a proprietary Dichrostachys glomerata extract (DYG-400®) on Adult's Sleep Quality and Activity: A Pilot Trial

Objectives: The purpose of this study was to examine the effectiveness of Dichrostachys glomerata (Dyglomera®) supplementation on adults’ sleep quality and daytime activity. Methods: Using a double-blind placebo-controlled pilot trial, 56 adults with nonclinical poor sleep (M age = 44.50) were randomized to either the Dichrostachys glomerata Group (300 mg/d) or Placebo Group for 60 days. Outcomes were the self-reported Insomnia Severity Index and objective sleep and daytime activity via the Oura Ring. Analysis was undertaken at Day 0 (Baseline), Day 30, and Day 60. Results: The Dichrostachys glomerata Group had improved Insomnia Severity Index symptoms, with significant improvements from Day 0 to Day 60. Objective sleep measures indicated that the Dichrostachys glomerata Group had significantly improved sleep score and deep sleep duration, while the Placebo Group declined in these parameters. The Dichrostachys glomerata Group also improved on sleep latency and time awake, contrasting with worsened of these sleep metrics in the Placebo Group, p’s &lt; .05. No group differences were found for REM. The Dichrostachys glomerata Group improved significantly on the activity outcomes. Conclusion: These results provide preliminary support for the potential of Dichrostachys glomerata supplementation to enhance both sleep and daytime activity. Further research is warranted to validate these findings in diverse populations. Clinical trial registry = ISRCTN10099861.

Sleep Characteristics are Associated with Risk of Treated Diabetes Among Postmenopausal Women

ObjectiveThe purpose of this study was to determine whether sleep characteristics are associated with incidence of treated diabetes in postmenopausal individuals. MethodsPostmenopausal participants ages 50-79 years reported sleep duration, sleep-disordered breathing, or insomnia at baseline and again in a subsample 3 years later. The primary outcome was self-reported new diagnosis of diabetes treated with oral drugs or insulin at any time after baseline. Multivariable Cox proportional hazards models were used. ResultsIn 135,964 participants followed for 18.1 (± 6.3) years, there was a nonlinear association between sleep duration and risk of treated diabetes. Participants sleeping ≤5 hours at baseline had a 21% increased risk of diabetes compared with those sleeping 7 hours (adjusted hazard ratio [aHR] 1.21; 95% confidence interval [CI], 1.00-1.47). Those who slept for ≥9 hours had a nonsignificant 6% increased risk of diabetes compared with those sleeping 7 hours (aHR 1.06; 95% CI, 0.97-1.16). Participants whose sleep duration had decreased at 3 years had a 9% (aHR 1.09; 95% CI, 1.02-1.16) higher risk of diabetes than participants with unchanged sleep duration. Participants who reported increased sleep duration at 3 years had a risk of diabetes (HR 1.01; 95% CI, 0.95-1.08) similar to those with no sleep duration change. Participants at high risk of sleep-disordered breathing at baseline had a 31% higher risk of diabetes than those without (aHR 1.31; 95% CI, 1.26-1.37). No association was found between self-reported insomnia score and diabetes risk. ConclusionsSleep-disordered breathing and short or long sleep duration were associated with higher diabetes risk in a postmenopausal population.

People with IBD evidence more microarousals during sleep architecture assessments

ObjectivePoor sleep is common in inflammatory bowel disease (IBD) and may be associated with overall worse disease outcomes. While the sleep/IBD literature is growing, the data are often self-reported. Further,...

The association between polluting fuel use and self-reported insomnia among middle-aged and elderly Indian adults: Cross-sectional findings from the longitudinal ageing study in India

The association between polluting fuel use and self-reported insomnia among middle-aged and elderly Indian adults: Cross-sectional findings from the longitudinal ageing study in India

Self-reported insomnia is associated with urinary incontinence among older Indian adults: Evidence from the longitudinal ageing study in India (LASI)

Self-reported insomnia is associated with urinary incontinence among older Indian adults: Evidence from the longitudinal ageing study in India (LASI)

A comparison of psychiatric symptoms between mental health professionals with and without post-infection sequelae of COVID-19

Post-infection sequelae of COVID-19 (PISC) have raised public health concerns. However, it is not clear whether infected mental health professionals (MHPs) with PISC have experienced more psychiatric symptoms than MHPs without PISC do. This study examined differences in the prevalence of self-reported depression, anxiety, insomnia and suicidality as well as the network structures of these symptoms between these two groups. Participants completed questionnaire measures of psychiatric symptoms and demographics. Expected influence was used to measure centrality of symptoms and network comparison tests were adopted to compare differences in the two network models. The sample comprised 2,596 participants without PISC and 2,573 matched participants with PISC. MHPs with PISC had comparatively higher symptom levels related to depression (55.2% vs. 23.5 %), anxiety (32.0% vs. 14.9 %), insomnia (43.3% vs. 17.3 %), and suicidality (9.6% vs. 5.3 %). PHQ4 (“Fatigue”), PHQ6 (“Guilt”), and GAD2 (“Uncontrollable Worrying”) were the most central symptoms in the “without PISC” network model. Conversely, GAD3 (“Worry too much”), GAD5 (“Restlessness”), and GAD4 (“Trouble relaxing”) were more central in the “with PISC” network model. In sum, MHPs with PISC experienced comparatively more psychiatric symptoms and related disturbances. Network results provide foundations for the expectation that MHPs with PISC may benefit from interventions that address anxiety-related symptoms, while those without PISC may benefit from interventions targeting depression-related symptoms.

QOL-05. EXPLORATORY ANALYSIS OF COGNITIVE BEHAVIORAL THERAPY FOR INSOMNIA (CBT-I) AMONG PATIENTS WITH PRIMARY BRAIN TUMOR: EFFECTS ON DEPRESSION, ANXIETY, AND LIFE QUALITY

Abstract BACKGROUND Sleep disturbance is among the most common complaints endorsed by patients with a brain tumor diagnosis, yet the delivery of behavioral insomnia treatment is not standard practice in neuro-oncology. Our pilot trial of a 6-session group-based telehealth CBT-I program among primary brain tumor patients demonstrated clinically significant improvements in self-reported insomnia, fatigue, and sleep quality. In other cancer patient samples, CBT-I is also associated with improvements in psychosocial outcomes beyond sleep; thus, the aim of this exploratory analysis was to examine change in depression, anxiety, and life quality among primary brain tumor patients enrolled in CBT-I. METHODS This was a single-arm ORBIT Model Phase IIa proof-of-concept trial. N = 40 cognitively-intact participants (Mage = 52.4 + 12 years; 50.0% female) with a primary brain tumor and insomnia enrolled in a 6-week group-based telehealth CBT-I intervention with weekly 90-minute sessions led by graduate students in clinical psychology. Questionnaires (PHQ-9, GAD-7, EORTC-QLQ-30) were completed at baseline and 6 weeks. Within-person clinically significant improvement was calculated for intervention completers (n = 34) based on established cutoffs. RESULTS Approximately one-third of participants experienced clinically significant improvements in symptoms of depression (n = 12, 35.3%) and generalized anxiety (n = 11, 32.3%) following CBT-I, with 0 participants experiencing a clinically significant worsening of symptoms. Thirty-two of thirty-four participants (94.1%) reported clinically significant improvement in at least 1 domain of life quality spanning physical, role, emotional, and/or social functioning. CONCLUSIONS Findings suggest that a brief behavioral intervention for insomnia, CBT-I, may improve depression, anxiety, and life quality in addition to sleep among primary brain tumor patients. RESULTS from this proof-of-concept trial suggest proceeding to a test of CBT-I in comparison to a control group in order to bolster internal validity. In addition, future studies will examine sleep and related psychosocial outcomes over a longer follow-up period to assess maintenance of intervention effects.

Comprehensive assessment of sleep duration, insomnia, and brain structure within the UK Biobank cohort.

To assess for associations between sleeping more than or less than recommended by the National Sleep Foundation (NSF), and self-reported insomnia, with brain structure. Data from the UK Biobank cohort were analyzed (N between 9K and 32K, dependent on availability, aged 44 to 82 years). Sleep measures included self-reported adherence to NSF guidelines on sleep duration (sleeping between 7 and 9 hours per night), and self-reported difficulty falling or staying asleep (insomnia). Brain structural measures included global and regional cortical or subcortical morphometry (thickness, surface area, volume), global and tract-related white matter microstructure, brain age gap (difference between chronological age and age estimated from brain scan), and total volume of white matter lesions. Longer-than-recommended sleep duration was associated with lower overall grey and white matter volumes, lower global and regional cortical thickness and volume measures, higher brain age gap, higher volume of white matter lesions, higher mean diffusivity globally and in thalamic and association fibers, and lower volume of the hippocampus. Shorter-than-recommended sleep duration was related to higher global and cerebellar white matter volumes, lower global and regional cortical surface areas, and lower fractional anisotropy in projection fibers. Self-reported insomnia was associated with higher global gray and white matter volumes, and with higher volumes of the amygdala, hippocampus, and putamen. Sleeping longer than recommended by the NSF is associated with a wide range of differences in brain structure, potentially indicative of poorer brain health. Sleeping less than recommended is distinctly associated with lower cortical surface areas. Future studies should assess the potential mechanisms of these differences and investigate long sleep duration as a putative marker of brain health.

The association between polluted fuel use and self-reported insomnia symptoms among middle-aged and elderly Indian adults: a cross-sectional study based on LASI, wave 1

BackgroundInsomnia predisposes the aging population to reduced quality of life and poor mental and physical health. Evidence of the association between polluted fuel use and insomnia symptoms is limited and is non-existent for the Indian population. Our study aimed to explore the link between polluted fuel use and insomnia symptoms in middle-aged and older (≥ 45 years) Indian populations.MethodsWe utilized data from nationally representative Longitudinal Aging Study in India (LASI) Wave 1. Participants with complete information on fuel use, insomnia symptoms, and covariates were included. Insomnia symptoms were indicated by the presence of at least one of three symptoms: difficulty in initiating sleep (DIS), difficulty in maintaining sleep (DMS), or early morning awakening (EMA), ≥ 5 times/week. Survey-weighted multivariable logistic regression analyses were conducted to evaluate the association between polluted fuel use and insomnia symptoms. We also assessed the interaction of association in subgroups of age, gender, BMI, drinking, and smoking status.ResultsSixty thousand five hundred fifteen participants met the eligibility criteria. Twenty-eight thousand two hundred thirty-six (weighted percentage 48.04%) used polluted fuel and 5461 (weighted percentage 9.90%) reported insomnia symptoms. After full adjustment, polluted fuel use was associated with insomnia symptoms (OR 1.16; 95%CI 1.08–1.24) and was linked with DIS, DMS, and EMA (OR 1.14; 95%CI 1.05–1.24, OR 1.12; 95%CI 1.03–1.22, and OR 1.15; 95%CI 1.06–1.25, respectively). No significant interactions for polluted fuel use and insomnia symptoms were observed for analyses stratified by age, sex, BMI, drinking, or smoking.ConclusionsPolluted fuel use was positively related to insomnia symptoms among middle-aged and older Indians. Suggestions are offered within this article for further studies to confirm our results, to explore underlying mechanisms, and to inform intervention strategies.

A - 73 The Impact of Posttraumatic Stress Disorder on Cognitive Health in 9/11 Responders: the Role of Sleep Disturbances.

PTSD is known to have a long-term impact on cognitive health, specifically executive dysfunction. However, most studies have not tested possible mechanisms underpinning this association. Sleep disturbances have emerged as a potential pathway between PTSD and cognitive functioning. This study aimed to investigate whether sleep disturbances account for the association between PTSD and executive dysfunction in trauma-exposed first responders. Participants consisted of 9/11 WTC responders (N = 452, mean age = 55.22, SD = 8.73, 89% male, 90% White). Data collection occurred across 3 time points, each 1year apart. Measures included self-reported PTSD and insomnia symptoms, two weeks of Ecological Momentary Assessment of sleep duration and sleep quality, and the Trail Making Test part B. Due to high stability across 3years, the present study focused on mean, trait-like variables. Analyses adjusted for demographics, BMI, and trauma exposure severity. PTSD was associated with Trail Making Test part B (r = 0.10, p = 0.03), as well as insomnia (r = 0.63, p < 0.00) and sleep quality (r = -0.45, p < 0.00), but not sleep duration. Mediation analyses revealed that sleep quality fully accounts for the significant association between PTSD and executive functioning (indirect effect β= 0.056, p = 0.041, 95% CI [0.009, 0.108]). The current results highlight the important role that disturbances in sleep may have on cognitive health outcomes. Improving sleep, in the context of PTSD, could attenuate cognitive symptoms, and possibly protect against further decline. Future research conducted in the acute phase of trauma-exposure and PTSD is needed to clarify the directionality of these relationships, with longitudinal analyses that will allow form modeling cognitive decline.

Prevalence of Insomnia and Factors Influencing Its Incidence in Students of Tbilisi State Medical University: A Cross-Sectional Study.

Sleep is essential for overall health and well-being, however, medical students often face challenges in the form of insomnia or sleep-related disorders. This cross-sectional study investigates the factors influencing the incidence of insomnia in medical students at Tbilisi State Medical University during the 2022-2023 academic year. Using an online questionnaire, data was collected from 174 respondents with self-reported insomnia, and processed with spreadsheet software. The questionnaire collected demographic information, and data regarding sleeping patterns, and asked respondents to choose 'yes' or 'no' for each factor and its effect on their self-reported insomnia. After applying inclusion and exclusion factors, 122 responses were used for analysis. A chi-square analysis was conducted to verify the statistical significance of the data (p = 0.002002).The study revealed a high prevalence of 70.11% of respondents reporting sleeping difficulties. A total of 71.30% of respondents reported excessive workload as the most significant factor contributing to the incidence of their insomnia. Sixty-eight percentof respondents reported mental health issues(including anxiety and depression), and 65.5% reported improper sleep hygiene (including daytime napping and irregular sleep schedules) to play a role in the incidence of their insomnia. Social media and entertainment platform usage (59.8%) and stimulant consumption (48.4%) were comparatively less prominent but still noteworthy contributors to insomnia. The study also found that the majority of respondents (59.8%) experience onset-related insomnia, while 40.4% experience maintenance-related insomnia.This study found excessive workload to be the factor that most influenced the incidence of insomnia in medical students at Tbilisi State Medical University. This can be attributed to the increased academic load a medical student has to face and the worry about academic performance.Proper sleep hygiene, mental health support, and workload adjustments are suggested to decrease the incidence of insomnia among medical students at Tbilisi State Medical University.

The impact of insomnia symptoms on obesity among Mexicans aged 50 and older.

To examine the association between insomnia and obesity in Mexican adults aged 50 and older. We used data from the Mexican Health and Aging Study (2015-2018). Self-reported insomnia was measured using the modified insomnia severity index with scores ranging from zero to six. Obesity was categorized using body mass index (BMI ≥ 30 kg/m2). We used generalized estimating equations to assess the association between insomnia and obesity over three years. Insomnia was associated with obesity (odds ratio [OR]: 1.06, 95% confidence interval [CI]: 1.01,1.11), among those with no obesity at baseline. Among those with obesity, insomnia was not associated with changes in BMI. Lastly, obesity was not associated with changes in insomnia symptoms. This work highlights the association between insomnia and obesity among older Mexican adults and demonstrates the importance of further studies on the effects of insomnia within this population.

Internet-delivered cognitive behavioral therapy for adolescents with insomnia: Feasibility and preliminary efficacy.

Insomnia is common in adolescents. This study evaluated feasibility and preliminary efficacy of a six-week internet-delivered cognitive-behavioral therapy for insomnia (ICBT-I) in adolescents. In this uncontrolled pilot study, participants (n = 27, 78% female) completed assessments pre- and post intervention. Data on recruitment, adherence to treatment, treatment activity, satisfaction and credibility was collected to assess feasibility. Self-reported insomnia symptoms, sleep parameters as well as depression, anxiety and daytime function were also assessed. Participants showed good adherence to treatment and found the intervention overall credible and satisfactory. From pre- to post-assessment, statistically significant improvements were found for insomnia symptoms (p < .001; d = 1.02), sleep onset latency (p < .001; d = .39), wake after sleep onset (p = .001; d = .34), sleep efficiency (p < .001; d = .5) and depression (p = .01, d = .37). Changes in scores of total sleep time, generalized anxiety, daytime sleepiness and functional disability were not significant. The present study indicates that ICBT-I is well accepted by adolescents, that insomnia symptoms and sleep parameters can improve following the intervention, and that co-morbid symptoms of depression can be reduced. Due to the limited sample size and the uncontrolled design, the suggested results need to be replicated in well-powered controlled clinical trials.

Treatment of worry and comorbid symptoms within depression, anxiety, and insomnia with a group-based rumination-focused cognitive-behaviour therapy in a primary health care setting: a randomised controlled trial.

Repetitive negative thinking (RNT) has been described as a maintaining transdiagnostic factor for psychopathology within the areas of depression, anxiety and insomnia. We investigated the effects of rumination-focused cognitive-behaviour therapy (RF-CBT) in a group format at a primary health care centre on symptoms of depression, anxiety, insomnia, RNT, and quality of life. The participants presented clinical symptom levels of worry and at least two disorders among anxiety disorders, major depressive disorder, and insomnia disorder. A randomised controlled superiority parallel arm trial was used. 73 participants were included and randomised in pairs to either group-administered RF-CBT or a waiting list condition. The primary outcomes were self-rated worry and transdiagnostic symptoms (depression, anxiety, and insomnia). Intention-to-treat analyses of group differences were conducted using linear mixed models. Adverse side effects and incidents were presented descriptively. Group RF-CBT significantly reduced self-reported insomnia at post-treatment and self-reported insomnia and depression at the 2 month-follow-up, relative to the wait-list control group. There was no significant difference in change in RNT, anxiety, or quality of life. The current study suggests that group-administered RF-CBT may be effective for insomnia and potentially effective for depression symptomatology. However, the study was underpowered to detect small and moderate effects and the results should therefore be interpreted with caution.

Sleep-wake timing and chronotype in perinatal periods: longitudinal changes and associations with insomnia symptoms, sleep-related impairment, and mood from pregnancy to 2 years postpartum.

Across the perinatal transition, existing research focuses mainly on significant changes in sleep duration and quality, neglecting sleep timing. This study investigated change trajectories of sleep timing and chronotype from late pregnancy to 2 years postpartum and examined longitudinal associations of chronotype with symptoms of insomnia, daytime sleep-related impairment, and mood. Data were from a two-arm randomised controlled trial testing parent-focused wellbeing interventions. Participants were a community sample of nullipara without severe sleep/mental health conditions. Participants self-reported bedtime, rise-time, chronotype, insomnia symptoms, sleep-related impairment, depression, and anxiety at seven time points: gestation Weeks 30 and 35, and postpartum Months 1.5, 3, 6, 12 and 24. Trajectories were estimated using mixed-effects models with continuous time, quadratic splines, and a knot at childbirth, controlling for age and group allocation. A total of 163 participants (mean [SD] age 33.35 [3.42] years) took part. Bedtime and rise-times delayed during late pregnancy (~8 and ~20 min, respectively) but became progressively earlier (~20 and ~60 min, respectively) over the 2 postpartum years. Chronotype became more eveningness in late pregnancy, and more morningness after childbirth, however changes were small. Controlling for sleep duration and efficiency, greater morningness was associated with significantly less symptoms of insomnia and sleep-related impairment over time (all p < 0.001); longitudinal associations between chronotype and symptoms of depression and anxiety were non-significant (all p > 0.65). Sleep-wake timing and chronotype became progressively earlier from pregnancy to 2 years postpartum. Morningness chronotype may be sleep-protective during the transition from pregnancy to parenthood. Mechanisms underlying these associations require further research.