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Akiyoshi Shimura, Sakai Hideo, Yoshikazu Takaesu, Ryota Nomura, Yoko Komada, Takeshi Inoue
OBJECTIVE: Sleep affects adolescents in various ways. However, the effects of multiple factors on sleep hygiene remain unclear. A comprehensive assessment of the effects of life habits on sleep in high-school students was conducted. METHODS: A cross-sectional survey of 344 high school students (age range 15-17; 171 boys, 173 girls) in Tokyo, Japan was conducted in 2015. Complete responses were provided by 294 students. Demographic variables, Pittsburgh Sleep Quality Index (PSQI), diurnal type scale, Pediatric Daytime Sleepiness Scale (PDSS), and life habits such as dinnertime, viewing electronic displays, caffeine intake, sunlight in the morning, and the brightness of the room in the night were asked...
April 2018: Sleep Medicine
Murray B Stein, Michael J McCarthy, Chia-Yen Chen, Sonia Jain, Joel Gelernter, Feng He, Steven G Heeringa, Ronald C Kessler, Matthew K Nock, Stephan Ripke, Xiaoying Sun, Gary H Wynn, Jordan W Smoller, Robert J Ursano
Insomnia is a worldwide problem with substantial deleterious health effects. Twin studies have shown a heritable basis for various sleep-related traits, including insomnia, but robust genetic risk variants have just recently begun to be identified. We conducted genome-wide association studies (GWAS) of soldiers in the Army Study To Assess Risk and Resilience in Servicemembers (STARRS). GWAS were carried out separately for each ancestral group (EUR, AFR, LAT) using logistic regression for each of the STARRS component studies (including 3,237 cases and 14,414 controls), and then meta-analysis was conducted across studies and ancestral groups...
March 8, 2018: Molecular Psychiatry
Tom C Zwart, Marcel G Smits, Toine C G Egberts, Carin M A Rademaker, Ingeborg M van Geijlswijk
The extent of continuance of melatonin therapy initiated in pre-pubertal children with chronic sleep onset insomnia (CSOI) was investigated in young adult life. Sleep timing, sleep quality, adverse events, reasons for cessation of therapy, and patient characteristics with regard to therapy regimen, chronotype and lifestyle factors possibly influencing sleeping behavior were assessed. With an online survey using questionnaires (Pittsburgh Sleep Quality Index, Insomnia Severity Index, Morningness-Eveningness Questionnaire, and Munich Chronotype Questionnaire), outcomes were measured and compared with age-related controls...
March 2, 2018: Healthcare (Basel, Switzerland)
Jutta S Mayer, Katharina Hees, Juliane Medda, Oliver Grimm, Philip Asherson, Mariano Bellina, Michael Colla, Pol Ibáñez, Elena Koch, Antonio Martinez-Nicolas, Adrià Muntaner-Mas, Anna Rommel, Nanda Rommelse, Saskia de Ruiter, Ulrich W Ebner-Priemer, Meinhard Kieser, Francisco B Ortega, Johannes Thome, Jan K Buitelaar, Jonna Kuntsi, J Antoni Ramos-Quiroga, Andreas Reif, Christine M Freitag
BACKGROUND: The risk for major depression and obesity is increased in adolescents and adults with attention-deficit / hyperactivity disorder (ADHD) and adolescent ADHD predicts adult depression and obesity. Non-pharmacological interventions to treat and prevent these co-morbidities are urgently needed. Bright light therapy (BLT) improves day-night rhythm and is an emerging therapy for major depression. Exercise intervention (EI) reduces obesity and improves depressive symptoms. To date, no randomized controlled trial (RCT) has been performed to establish feasibility and efficacy of these interventions targeting the prevention of co-morbid depression and obesity in ADHD...
February 26, 2018: Trials
Mirjam L Kerpershoek, Niki Antypa, Julia F Van den Berg
Caffeine is often used to reduce sleepiness; however, research suggests that it can also cause poor sleep quality. The timing of caffeine use, amongst other factors, is likely to be important for the effects it has on sleep quality. In addition, individual differences exist in the effect of caffeine on sleep quality. This cross-sectional study investigated the influence of the timing of caffeine consumption on and a possible moderating role of chronotype in the relationship between caffeine consumption and sleep quality in 880 students (74...
February 25, 2018: Journal of Sleep Research
Adrian A Chrobak, Anna Tereszko, Daria Dembinska-Krajewska, Aleksandra Arciszewska, Ewa Dopierała, Marcin Siwek, Dominika Dudek, Janusz K Rybakowski
BACKGROUND: Growing number of studies indicates a link between eveningness chronotype, affective temperaments and bipolarity, both in patients with mood disorders and in general population. Given these tripartite associations, we hypothesized that the effect of circadian preferences on the bipolarity may be mediated by the temperamental traits. METHODS: The study included 1449 subjects (402 men and 1047 women). They all fulfilled a web-based questionnaire, consisting of the Composite Scale of Morningness (CSM), Mood Disorder Questionnaire (MDQ), Hypomania Checklist-32 (HCL-32) and the Temperament Evaluation of the Memphis, Pisa and San Diego-Autoquestionnaire (TEMPS-A)...
February 16, 2018: Journal of Affective Disorders
Jana Kühnel, Christine J Syrek, Anne Dreher
Background: This daily diary study investigates the phenomenon of bedtime procrastination. Bedtime procrastination is defined as going to bed later than intended, without having external reasons for doing so. We highlight the role chronotype (interindividual differences in biological preferences for sleep-wake-times) plays for bedtime procrastination. Moreover, we challenge the view that bedtime procrastination is the result of a lack of self-regulatory resources by investigating momentary self-regulatory resources as a predictor of day-specific bedtime procrastination...
2018: Frontiers in Psychology
Jack Barton, Simon D Kyle, Filippo Varese, Steven H Jones, Gillian Haddock
The present review aimed to 1) identify what sleep disturbances co-occur alongside psychotic-like, dissociative and hypomanic experiences; 2) assess the strength of potential associations between the severity of sleep disturbances and of the experiences studied; and 3) appraise evidence for a causal link. MedLine and PsycInfo were searched and 44 studies were deemed eligible. Results showed that insomnia was associated with all individual psychotic-like, dissociative and hypomanic experiences reviewed (effect size range: small-to-large)...
February 13, 2018: Neuroscience and Biobehavioral Reviews
Bharati Prasad, Alana D Steffen, Hans P A Van Dongen, Francis M Pack, Inna Strakovsky, Bethany Staley, David F Dinges, Greg Maislin, Allan I Pack, Terri E Weaver
Study Objectives: Significant interindividual variability in sleepiness is observed in clinical populations with obstructive sleep apnea (OSA). This phenomenon is only partially explained by the apnea-hypopnea index (AHI). Understanding factors that lead to sleepiness is critical to effective management of patients with OSA. We examined demographic and other factors associated with sleepiness in OSA. Methods: Prospective study of 283 patients with newly diagnosed OSA by polysomnography (AHI ≥ 5 per hour)...
February 10, 2018: Sleep
Thomaz Oliveira, Victor Marinho, Valécia Carvalho, Francisco Magalhães, Kaline Rocha, Carla Ayres, Silmar Teixeira, Monara Nunes, Victor Hugo Bastos, Giovanny R Pinto
OBJECTIVES: The objective of this study was to present a broad view of how genetic polymorphisms in genes that control the rhythmicity and function of circadian rhythm may influence the etiology, pathophysiology and treatment of bipolar disorder (BD). METHODS: A bibliographic search was performed to identify and select papers reporting studies on variations in circadian genes and BD. A search of Medline, Google Scholar, Scopus, and Web of Science was carried out to review the literature...
February 13, 2018: Bipolar Disorders
Keresa Kanagarajan, Karine Gou, Christina Antinora, Asli Buyukkurt, Olivia Crescenzi, Serge Beaulieu, Kai-Florian Storch, Outi Mantere
The Morningness-Eveningness Questionnaire (MEQ) is among the most commonly used scales to measure chronotype. We aimed to evaluate psychometric properties and clinical correlates of MEQ in bipolar disorder. Patients with a clinical diagnosis of bipolar disorder (n = 53) answered questionnaires for chronotype (MEQ), mood (Quick Inventory of Depressive Symptoms-16, Altman Self-Rating Mania Scale), insomnia (Athens Insomnia Scale, AIS), and sleepiness (Epworth Sleepiness Scale). Mood was evaluated using Montgomery-Åsberg Depression Rating Scale and Young Mania Rating Scale...
February 3, 2018: Psychiatry Research
Luísa K Pilz, Lena Katharina Keller, David Lenssen, Till Roenneberg
The Pittsburgh Sleep Quality Index (PSQI) is the most common measure of sleep quality. Its questions refer to "usual" sleep habits during the last month. Considering how different sleep-wake behavior can be between work- and work-free days, we hypothesized that sleep quality should show similar differences.We investigated these potential differences in a cross-sectional online study using the original and two adapted versions of the PSQI that replaced "usual" by explicitly referring to sleep on work- or work-free days...
February 6, 2018: Sleep
María Juliana Leone, Alejo Salles, Alejandro Pulver, Diego Andrés Golombek, Mariano Sigman
Time representation is a fundamental property of human cognition. Ample evidence shows that time (and numbers) are represented in space. However, how the conceptual mapping varies across individuals, scales, and temporal structures remains largely unknown. To investigate this issue, we conducted a large online study consisting in five experiments that addressed different time scales and topology: Zones of time, Seasons, Days of the week, Parts of the day and Timeline. Participants were asked to map different kinds of time events to a location in space and to determine their size and color...
March 2018: Consciousness and Cognition
Chunliu Luo, Jihui Zhang, Weijun Chen, Wanxian Lu, Jiyang Pan
BACKGROUND: This study aimed to examine the one-year incidence and persistence of excessive daytime sleepiness (EDS) in rural Chinese adolescents and their risk factors. In addition, we also aimed to explore the potential bidirectional associations of EDS with anxiety symptoms and depressive symptoms. METHODS: A total of 3736 adolescents from 5 high schools from rural area in the south China were eligible for follow-up. Among them, 2787 responded to follow-up after one year...
February 1, 2018: Journal of Affective Disorders
Johan Björkqvist, Anu-Katriina Pesonen, Liisa Kuula, Hanna-Maria Matinolli, Aulikki Lano, Marika Sipola-Leppänen, Marjaana Tikanmäki, Dieter Wolke, Marjo-Riitta Järvelin, Johan G Eriksson, Sture Andersson, Marja Vääräsmäki, Kati Heinonen, Katri Räikkönen, Petteri Hovi, Eero Kajantie
A preference for eveningness (being a "night owl") and preterm birth (<37 weeks of gestation) are associated with similar adversities, such as elevated blood pressure, impaired glucose regulation, poorer physical fitness, and lower mood. Yet, it remains unclear if and how preterm birth is associated with circadian preference. The aim of this study was to assess this association across the whole gestation range, using both objective and subjective measurements of circadian preference. Circadian preference was measured among 594 young adults (mean age 24...
January 30, 2018: Chronobiology International
Júnia Maria Serra-Negra, Frank Lobbezoo, Patricia Correa-Faria, Luca Lombardo, Giuseppe Siciliani, Edoardo Stellini, Daniele Manfredini
OBJECTIVES: A cross-sectional study was performed to assess the association between possible sleep bruxism (SB) and awake bruxism (AB) with sleep characteristics and chronotype (i.e. circadian cycle preference). METHODS: One-hundred-nineteen young adults filled out a self-reported questionnaire to assess SB and AB, a questionnaire about daily life aspects, as well as the Morningness-Eveningness Questionnaire (MEQ) to profile chronotype. RESULTS: The frequency of self-reported SB and AB was 25...
January 29, 2018: Cranio: the Journal of Craniomandibular Practice
Ryan W Logan, Brant P Hasler, Erika E Forbes, Peter L Franzen, Mary M Torregrossa, Yanhua H Huang, Daniel J Buysse, Duncan B Clark, Colleen A McClung
Sleep homeostasis and circadian function are important maintaining factors for optimal health and well-being. Conversely, sleep and circadian disruptions are implicated in a variety of adverse health outcomes, including substance use disorders. These risks are particularly salient during adolescence. Adolescents require 8 to 10 hours of sleep per night, although few consistently achieve these durations. A mismatch between developmental changes and social/environmental demands contributes to inadequate sleep...
December 15, 2017: Biological Psychiatry
Mariana Batista Ribeiro, Daniele Manfredini, Cláudia Tavares-Silva, Leandro Costa, Ronir Raggio Luiz, Saul Paiva, Júnia Maria Serra-Negra, Andréa Fonseca-Gonçalves, Lucianne Cople Maia
Sleep bruxism (SB) in children has been associated with several sleep characteristics, which may alter their sleep pattern. This change affects the internal biological clock and consequently the chronotype profile. The aim of this study was to evaluate the existence of an association between possible SB in children with specific chronotype profiles and sleep characteristics. The study included 207 parents/guardians of children aged between 3 and 12 years who were waiting for their children's dental treatment at the Pediatric Dentistry Clinic of the Federal University of Rio de Janeiro, Brazil...
January 24, 2018: Chronobiology International
Annika Dimitrov, Ilya M Veer, Julia Kleeblatt, Florian Seyfarth, Till Roenneberg, Marcus Ising, Manfred Uhr, Martin E Keck, Achim Kramer, Maximilian Berger, Lara von Koch, Henrik Walter, Mazda Adli
Past studies examining the effect of chronotype and social jetlag on psychological well-being have been inconsistent so far. Here, we recruited participants from the general population and enquired about their natural sleeping behavior, sleep quality, depressive symptoms, and perceived stress. Partial correlations were computed between sleep variables and indicators of psychological well-being, controlling for age and sex. Less sleep during work days was found a good indicator for impairments in psychological well-being...
January 1, 2018: Journal of Health Psychology
Beatriz Vera, Hassan S Dashti, Purificación Gómez-Abellán, Antonio M Hernández-Martínez, Alberto Esteban, Frank A J L Scheer, Richa Saxena, Marta Garaulet
Evening chronotype associates with health complications possibly via lifestyle factors, while the contribution of genetics is unknown. The aim was to study the relative contributions of genetics, lifestyle, and circadian-related physiological characteristics in metabolic risk of evening chronotype. In order to capture a biological contribution to chronotype, a genetic-risk-score (GRS), comprised of 15 chronotype-related variants, was tested. Moreover, a wide range of behavioral and emotional eating factors was studied within the same population...
January 17, 2018: Scientific Reports
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