The reliability and validity of the Korean version of the sleep health index using self-report measures and wearable-derived sleep metrics.

Purpose: This study aimed to validate the Korean version of the Sleep Health Index (K-SHI) using both self-report measures and objective sleep indices from wearable devices.

Methods: A total of 204 adults (mean age 30.35 ± 9.

Development of the Adaptive Cognition and Behaviors about Sleep-6 (ACBS-6) for sleep-related conditions or behaviors diminishing insomnia severity.

Background: This study aimed to develop a scale to assess adaptive sleep-related beliefs and behaviors, measuring how well individuals accept sleep disturbances, in the Korean general population.

Methods: We conducted an anonymous online survey among the Korean general population. The scale development involved the following process: 1) defining the purpose of developing the scale, 2) generating appropriate items, 3) reducing redundant items, 4) conducting psychometric tests and further reducing items, and 5) developing the final version of the scale.

Differences in Infant and Parental Sleep and Sleeping Location in a Multi-National Study.

Objectives: This study investigated cross-country differences in infant and maternal sleep across Korea, the U.S.A.

Demographic and Sleep Study Factors Influencing Short-Term Adherence to Positive Airway Pressure Therapy in Obstructive Sleep Apnea.

Positive airway pressure (PAP) therapy effectively treats obstructive sleep apnea (OSA), yet adherence to the therapy presents significant challenges. This study identifies demographic and sleep study factors that influence short-term adherence to PAP therapy among patients with OSA by comparing data from adherent and non-adherent groups. Patients diagnosed with OSA via polysomnography who commenced PAP therapy after titration were divided into adherent and non-adherent groups.

Development of the Dysfunctional Beliefs about Sleep for shift Workers scale (DBSW) for shift-working registered nurses.

Introduction: We aimed to develop a sleep-related dysfunctional beliefs scale that can be applied specifically to shift workers.

Methods: The Dysfunctional Beliefs about Sleep for shift Workers scale (DBSW) was developed under the standard rating scale development process. We conducted two online surveys to run an exploratory factor analysis (EFA, Study I,  = 323) and a confirmatory factor analysis (CFA, Study II,  = 300) for the new scale.

Failing to plan: Bedtime planning, bedtime procrastination, and objective sleep in university students.

Study Objectives: Many people go to bed later than intended, yet very little is known about how bedtime plans are formed and followed. This study aimed to characterize bedtime planning, procrastination, and their relationship with objective sleep behavior among university students.

Methods: Participants (N = 119; full-time university students) were monitored for 2-4 weeks during their term time.

SymScore: Machine learning accuracy meets transparency in a symbolic regression-based clinical score generator.

Self-report questionnaires play a crucial role in healthcare for assessing disease risks, yet their extensive length can be burdensome for respondents, potentially compromising data quality. To address this, machine learning-based shortened questionnaires have been developed. While these questionnaires possess high levels of accuracy, their practical use in clinical settings is hindered by a lack of transparency and the need for specialized machine learning expertise.

A Multiple Mediator Model of Depression, Dysfunctional Beliefs about Sleep, and Sleep Effort in the Relationship between Psychological Inflexibility and Insomnia in Shift Working Nurses.

The aims of this study were to explore the influence of shift working nursing professionals' psychological inflexibility on their level of insomnia. Additionally, we investigated the mediation effect of depression and sleep-related cognitions on this association. An online survey was conducted among 202 nursing professionals at Asan Medical Center from July to August, 2023.

How many days are enough? Sleep-wake timing regularity and fragmentation scores change with the number of days included.

The duration of sleep data collection from actigraphy is often influenced by practical factors (e.g. workdays versus non-workdays), but the impact of the variation of duration on outcome measures of interest has not been well explored.

Validation of the Karolinska Sleepiness Scale in Korean.

Background And Purpose: The Karolinska Sleepiness Scale (KSS) is widely used for assessing current level of sleepiness, but it has not been validated in South Korea. This study aimed to validate the KSS using the Stanford Sleepiness Scale (SSS), polysomnography (PSG), and electroencephalography (EEG).

Methods: The sample consisted of 27 adult participants in this study aged 40.

Association of nightmares with cardio-cerebrovascular disease, hypertension and hyperlipidemia in older adults: A population-based cross-sectional study.

Objective: This cross-sectional study investigated the relationship of nightmares with cardio-cerebrovascular disease (CVD), hypertension and hyperlipidemia which are major preceding diseases of CVD in older adults.

Methods: Participants (n = 2824; mean age 63.6 ± 6.

Effects of paternal involvement in nighttime childcare on child and maternal sleep: exploring the roles of relationship satisfaction and maternal competence about child sleep.

Study Objectives: Supportive coparenting between couples has been shown to have positive effects on the dyadic relationship, child development, and parental and child sleep. This study aimed to investigate the association between paternal involvement in nighttime childcare and child and maternal sleep, while exploring relationship satisfaction and maternal competence about child sleep as mediators.

Methods: The sample consisted of 290 mothers (mean age ± standard deviation = 34.

Fatigued but not sleepy? An empirical investigation of the differentiation between fatigue and sleepiness in sleep disorder patients in a cross-sectional study.

Objective: Sleepiness and fatigue are common complaints among individuals with sleep disorders. The two concepts are often used interchangeably, causing difficulty with differential diagnosis and treatment decisions. The current study investigated sleep disorder patients to determine which factors best differentiated sleepiness from fatigue.

Validating the Dutch Eating Behavior Questionnaire for Children (DEBQ-C) among Korean children and adolescents with high weight.

Background: Using reliable measurement tools is becoming increasingly important as the prevalence of obesity among children increases in Korea. The Dutch Eating Behavior Questionnaire for Children (DEBQ-C) measures three eating behaviors associated with overeating. This study aims to validate the DEBQ-C for use among Korean children and adolescents with high body weight.

A randomized controlled trial of a behavioral intervention for decreasing bedtime procrastination using a wait-list control group in a non-clinical sample of young adults.

Study Objectives: Bedtime Procrastination (BP) is defined as the behavior of going to bed later than intended, without external reasons. This study is a randomized controlled trial aiming to establish efficacy of a behavioral intervention to decrease BP in a non-clinical sample.

Method: This was an open-label trial that was conducted in sixty participants (mean age 21.

Can adding personalized rule-based feedback improve the therapeutic effect of self-help digital cognitive behavioral therapy for insomnia in young adults?

Introduction: Cognitive-behavioral therapy for insomnia (CBT-I) is recommended as the first-line treatment for insomnia, but low accessibility and relatively high cost limits the dissemination of the treatment. Several forms of digital CBT-I have been developed to increase the accessibility and shown to be effective; however, the treatment effect may be restricted by the lack of interaction within the treatment. The current study examines whether the therapeutic effects of self-help digital CBT-I could be enhanced by adding simple rule-based personalized feedback.

Randomized controlled trial of cognitive behavioral therapy for perinatal insomnia: postpartum outcomes.

Study Objectives: This study aimed to assess the effectiveness of cognitive behavioral therapy for insomnia (CBTI) during the postpartum period as part of a larger randomized controlled trial of CBTI on perinatal insomnia.

Methods: A total of 179 women of 18-30 gestational weeks with insomnia disorder were randomly assigned to CBTI or an active control (CTRL) therapy. Participants were assessed between 18 and 32 weeks of pregnancy at baseline, after the intervention during pregnancy, and at 8, 18, and 30 weeks postpartum.

Validation of the Parental Understanding and Misperceptions about BAby's Sleep Questionnaire using auto-videosomnography.

Background: Previous studies have suggested that parental cognitions about child's sleep may be an important factor underlying pediatric sleep problems. The current study aimed to (a) develop an assessment tool measuring parental understanding and misperceptions about baby's sleep (PUMBA-Q); (b) validate the questionnaire using self-report and objective sleep measures.

Methods: There were 1,420 English-speaking caregivers (68.

Sleep and affect: A conceptual review.

Everyday experience suggests that sleep and affect are closely linked, with daytime affect influencing how we sleep, and sleep influencing subsequent affect. Yet empirical evidence for this bidirectional relationship between sleep and affect in non-clinical adult samples remains mixed, which may be due to heterogeneity in both construct definitions and measurement. This conceptual review proposes a granular framework that deconstructs sleep and affect findings according to three subordinate dimensions, namely domains (which are distinct for sleep and affect), methods (i.

Validation of the Korean version of the Metacognitions Questionnaire-Insomnia (MCQ-I) scale and development of shortened versions using the random forest approach.

We aimed to validate a Korean version of the Metacognitions Questionnaire-Insomnia (MCQ-I) and develop two shortened versions of the MCQ-I by applying the Random Forest (RF) algorithm. A total of 310 participants responded through an online survey, during April 3-6, 2021, which included rating scales such as the Insomnia Severity Index (ISI), Pittsburgh Sleep Quality Index (PSQI), Patient Health Questionnaire-9 (PHQ-9), and the Hospital Anxiety and Depression Scale (HADS), as well as the MCQ-I. After validating the scale, we developed two shortened versions by applying the RF.

Differences in Treatment Effects of Cognitive-behavioral Therapy for Insomnia Based on Sleep Reactivity: A Preliminary Study.

Introduction: Sleep reactivity is the trait-like degree to which stress disrupts sleep, resulting in difficulty falling and staying asleep. Although previous studies have suggested that individuals who have high sleep reactivity may be resistant to cognitive-behavioral therapy for insomnia (CBT-I) effects, there have been no studies that have investigated this empirically. This study explored differential treatment responses in CBT-I based on sleep reactivity levels.

How Does E-mail-Delivered Cognitive Behavioral Therapy Work for Young Adults (18-28 Years) with Insomnia? Mediators of Changes in Insomnia, Depression, Anxiety, and Stress.

This study examined whether cognitive behavioral therapy (CBT) for insomnia (CBT-I) improved insomnia severity, by changing sleep-related mediating factors. It also examined whether an improvement in insomnia led to enhanced mental health. This study was a secondary analysis of a randomized controlled trial of e-mail-delivered CBT-I for young adults with insomnia.

The Psychometric Properties of the French-Canadian Stress and Anxiety to Viral Epidemics-6 Scale for Measuring the Viral Anxiety of the General Population During the COVID-19 Pandemic.

Objective: This study examined the psychometric properties of the French-Canadian version of the Stress and Anxiety to Viral Epidemics-6 items (SAVE-6) scale for assessing the anxiety response to the viral epidemic among the general population in Quebec, Canada.

Methods: A total of 590 participants responded to a confidential online survey between September 28 and October 18, 2020. Confirmatory Factor Analysis (CFA) was conducted to explore the factor structure of the scale.

Predictors of dropout in university students participating in an 8-week e-mail-based cognitive-behavioral therapy for insomnia intervention.

Purpose: We conducted an exploratory study to identify risk factors of dropout in an 8-week e-mail-based cognitive-behavioral therapy for insomnia (REFRESH) to improve sleep among university students with insomnia symptoms.

Methods: University and graduate students in Hong Kong and Korea who scored higher than 10 on the Insomnia Severity Index participated in REFRESH.

Results: Of 158 participants from Hong Kong (n = 43) and Korea (n = 115), 90 (57%) did not complete all 7 sessions, while 52 of 90 (57.