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Journal of Sleep Research

Brian P Johnson, Steven M Scharf, Avelino C Verceles, Kelly P Westlake
Sleep is an important component of motor memory consolidation and learning, providing a critical tool to enhance training and rehabilitation. Following initial skill acquisition, memory consolidation is largely a result of non-rapid eye movement sleep over either a full night or a nap. Targeted memory reactivation is one method used to enhance this critical process, which involves the pairing of an external cue with task performance at the time of initial motor skill acquisition, followed by replay of the same cue during sleep...
February 11, 2019: Journal of Sleep Research
Mercè Gasa, Carla López-Padrós, Carmen Monasterio, Neus Salord, Mercedes Mayos, Núria Vilarrasa, Fernando Fernandez-Aranda, Josep M Montserrat, Jordi Dorca
Central obesity is the main risk factor for obstructive sleep apnea (OSA). Whether there exists a central-obesity anthropometric that better explains apnea-hypopnea index (AHI) variability in the general population and in sleep cohorts is unknown, and this is even less explored among increasing grades of obesity. The objective of the study is to investigate whether there is an anthropometric that better explains AHI variability in a sample of morbidly obese women awaiting bariatric surgery (BS). A prospective multicentre cross-sectional study was conducted in consecutive women before BS...
February 11, 2019: Journal of Sleep Research
Andras Bikov, Márton Kolossváry, Adam L Jermendy, Zsofia D Drobni, Adam D Tarnoki, David L Tarnoki, Bianka Forgó, Daniel T Kovacs, Gyorgy Losonczy, Laszlo Kunos, Szilard Voros, Bela Merkely, Pal Maurovich-Horvat
Obstructive sleep apnea (OSA) is associated with an increased risk of cardiovascular disease. Previous studies have assessed the relationship between OSA and coronary artery disease (CAD) using coronary artery calcium score (CAC) measurements. However, limited data are available regarding the association of OSA with non-calcified plaque burden. We therefore aimed to assess the relationship between CAD severity as assessed by coronary computed tomography angiography (CTA) and OSA. Forty-one adult subjects (59 ± 9 years, 15 men) underwent a 256-slice coronary CTA, which was followed by a diagnostic attended cardiorespiratory polygraphy (n = 13) or polysomnography (n = 28)...
February 6, 2019: Journal of Sleep Research
Ju Lynn Ong, June C Lo, Amiya Patanaik, Michael W L Chee
The electroencephalographic power spectra of non-rapid eye movement sleep in adults demonstrate trait-like consistency within participants across multiple nights, even when prior sleep deprivation is present. Here, we examined the extent to which this finding applies to adolescents who are habitually sleep restricted on school-days and sleep longer on weekends. We evaluated 78 adolescents across three sleep restriction groups who underwent different permutations of adequate sleep (9 hr time-in-bed), sleep restriction (5 hr time-in-bed), afternoon naps (1 hr afternoon) and recovery sleep (9 hr time-in-bed) that simulate behaviour on school-days and weekends...
February 6, 2019: Journal of Sleep Research
Luca Carnicelli, Michelangelo Maestri, Elisa Di Coscio, Gloria Tognoni, Monica Fabbrini, Alessandro Schirru, Filippo S Giorgi, Gabriele Siciliano, Ubaldo Bonuccelli, Enrica Bonanni
The main condition at increased risk of dementia is considered to be mild cognitive impairment. Mild cognitive impairment has been defined as a transitional state between normal aging and dementia, of which it may represent a prodrome. The aim of our study was to evaluate whether sleep variables (both conventional and microstructural ones) in subjects with mild cognitive impairment correlate with conversion to dementia. Nineteen subjects with amnestic mild cognitive impairment (mean age 68.5 ± 7.0 years) and 11 cognitively intact healthy elderly individuals (mean age 69...
February 6, 2019: Journal of Sleep Research
Kristina Puzino, Sara S Frye, Caitlin A LaGrotte, Alexandros N Vgontzas, Julio Fernandez-Mendoza
Self-reported somatic arousal remains a challenging clinical construct, particularly because only a subset of patients report symptoms such as racing heart, palpitations or increased body temperature interfering with their sleep. It is unclear whether self-reported somatic arousal is a marker of hyperarousal or co-morbid clinical anxiety in individuals with insomnia. Participants included 196 young adults aged 20.2 ± 1.0 years old who were predominantly females (75%). About 39% of the sample reported subthreshold insomnia, and about 8% reported clinically significant insomnia, based on their Insomnia Severity Index...
February 3, 2019: Journal of Sleep Research
Annika Gieselmann, Malik Ait Aoudia, Michelle Carr, Anne Germain, Robert Gorzka, Brigitte Holzinger, Birgit Kleim, Barry Krakow, Anna E Kunze, Jaap Lancee, Michael R Nadorff, Tore Nielsen, Dieter Riemann, Hinuga Sandahl, Angelika A Schlarb, Carolin Schmid, Michael Schredl, Victor I Spoormaker, Regina Steil, Annette M van Schagen, Lutz Wittmann, Maria Zschoche, Reinhard Pietrowsky
This consensus paper provides an overview of the state of the art in research on the aetiology and treatment of nightmare disorder and outlines further perspectives on these issues. It presents a definition of nightmares and nightmare disorder followed by epidemiological findings, and then explains existing models of nightmare aetiology in traumatized and non-traumatized individuals. Chronic nightmares develop through the interaction of elevated hyperarousal and impaired fear extinction. This interplay is assumed to be facilitated by trait affect distress elicited by traumatic experiences, early childhood adversity and trait susceptibility, as well as by elevated thought suppression and potentially sleep-disordered breathing...
January 29, 2019: Journal of Sleep Research
Jiri Nepozitek, Simona Dostalova, David Kemlink, Latica Friedrich, Iva Prihodova, Veronika Ibarburu Lorenzo Y Losada, Petr Dusek, Ondrej Bezdicek, Tomas Nikolai, Pavla Perinova, Irene Dall'Antonia, Pavel Dusek, Martin Ruml, Evzen Ruzicka, Karel Sonka
Fragmentary myoclonus is a result of muscle activity consisting of brief potentials in surface electromyography during polysomnography. Excessive fragmentary myoclonus is defined by increased intensity of the potentials. A few studies report excessive fragmentary myoclonus occurrence in neurodegenerative diseases. Because idiopathic rapid eye movement sleep behaviour disorder is considered as an early stage of neurodegeneration with involvement of the brainstem, we charted the prevalence and quantified the intensity of excessive fragmentary myoclonus in idiopathic rapid eye movement sleep behaviour disorder...
January 24, 2019: Journal of Sleep Research
Kira Vibe Jespersen, Marit Otto, Morten Kringelbach, Eus Van Someren, Peter Vuust
Music is often used as a self-help tool to alleviate insomnia. To evaluate the effect of bedtime music listening as a strategy for improving insomnia, we conducted an assessor-blinded randomized controlled trial. Fifty-seven persons with insomnia disorder were included and randomized to music intervention (n = 19), audiobook control (n = 19) or a waitlist control group (n = 19). The primary outcome measure was the Insomnia Severity Index. In addition, we used polysomnography and actigraphy to evaluate objective measures of sleep, and assessed sleep quality and quality of life...
January 24, 2019: Journal of Sleep Research
Ken-Ichi Yamada, Makoto Higashiyama, Hiroki Toyoda, Yuji Masuda, Mikihiko Kogo, Atsushi Yoshida, Takafumi Kato
Rhythmic jaw muscle activities frequently occur during non-rapid eye movement sleep in patients with sleep bruxism. The present study aimed to investigate the response characteristics of the masticatory rhythm generation during non-rapid eye movement sleep in animals. Eleven guinea pigs were surgically prepared for polygraphic recordings by electromyography, electrooculography, electroencephalography and electrocardiography with the implantation of a stimulating electrode. Repetitive electrical microstimulations at three intensities were applied to the corticobulbar tract under freely moving conditions...
January 23, 2019: Journal of Sleep Research
Arne Lowden, Roberta Nagai, Torbjörn Åkerstedt, Kjell Hansson Mild, Lena Hillert
Studies on sleep after exposure to radiofrequency electromagnetic fields have shown mixed results. We investigated the effects of double-blind radiofrequency exposure to 1,930-1,990 MHz, UMTS 3G signalling standard, time-averaged 10 g specific absorption rate of 1.6 W kg-1 on self-evaluated sleepiness and objective electroencephalogram architecture during sleep. Eighteen subjects aged 18-19 years underwent 3.0 hr of controlled exposure on two consecutive days 19:45-23:00 hours (including 15-min break); active or sham prior to sleep, followed by full-night 7...
January 15, 2019: Journal of Sleep Research
Baran Balcan, Erik Thunström, Patrick J Strollo, Yüksel Peker
We explored determinants of depressive mood in adults with coronary artery disease and obstructive sleep apnea and response to positive airway pressure treatment in sleepy and non-sleepy phenotypes. In this secondary analysis of the RICCADSA trial conducted in Sweden, 493 cardiac patients with obstructive sleep apnea (n = 386) or no obstructive sleep apnea (n = 107) with complete Epworth Sleepiness Scale and Zung Self-rating Depression Scale questionnaires were included. Sleepy (Epworth Sleepiness Scale ≥10) versus non-sleepy (Epworth Sleepiness Scale <10) patients with depressive mood (Zung Self-rating Depression Scale score ≥50) were evaluated after 3 and 12 months of positive airway pressure treatment...
January 9, 2019: Journal of Sleep Research
Marion Clé, Jean-Baptiste Maranci, Sebastian Weyn Banningh, Jade Lanfranchi, Marie Vidailhet, Isabelle Arnulf
Human foetuses and newborns smile first during sleep, before they smile while awake and interacting with caregivers. Whether smiling persists during adult sleep, and expresses inner joy, is yet unknown. Smiles were looked for during night-time video-polysomnography combined with electromyography of the zygomatic and orbicularis oculi muscles in 100 controls, 22 patients with sleepwalking and 52 patients with rapid eye movement (REM) sleep behaviour disorder. Autonomous reactions (heart rate and level of vasoconstriction) and the presence of rapid eye movements were examined during smiles and laughs...
January 6, 2019: Journal of Sleep Research
Torbjörn Åkerstedt, Johanna Schwarz, Georg Gruber, Jenny Theorell-Haglöw, Eva Lindberg
There is a lack of studies on the association between total sleep time (TST) and other polysomnographical parameters. A key question is whether a short sleep is an expression of habitual short sleep, or whether it reflects temporary impairment. The purpose of the present study was to investigate the association between TST and amount of sleep stages and sleep continuity measures, in a large population-based sample of women (n = 385), sleeping at home in a normal daily life setting. The results show that sleep efficiency, N1 (min), N2 (min), REM (min), REM% and proportion of long sleep segments, increased with increasing TST, whereas the number of awakenings/hr, the number of arousals/hr, N1% and REM intensity decreased...
January 4, 2019: Journal of Sleep Research
Mireia Adelantado-Renau, Maria Reyes Beltran-Valls, Jairo H Migueles, Enrique G Artero, Alejandro Legaz-Arrese, Ana Capdevila-Seder, Diego Moliner-Urdiales
Adequate sleep has been positively related with health and school achievement outcomes during adolescence. The aim of this study was to investigate the associations of objectively measured and self-reported sleep duration and quality with academic and cognitive performance in adolescents. This study was conducted with 257 adolescents (13.9 ± 0.3 years) from the DADOS study (Deporte, ADOlescencia y Salud). Objectively measured and self-reported sleep duration and quality were obtained by a wrist-worn GENEActiv accelerometer and the Spanish version of Pittsburgh Sleep Quality Index questionnaire, respectively...
January 4, 2019: Journal of Sleep Research
Barbara F Thumann, Claudia Börnhorst, Nathalie Michels, Toomas Veidebaum, Antonia Solea, Lucia Reisch, Luis A Moreno, Fabio Lauria, Jaakko Kaprio, Monica Hunsberger, Regina Felső, Wencke Gwozdz, Stefaan De Henauw, Wolfgang Ahrens
Research on associations of positive mental health, in contrast to mental ill-health, with sleep duration and sleep disturbances in young populations is scarce. In particular, longitudinal studies focussing on the influence of positive mental health on sleep characteristics are lacking. Therefore, we investigated cross-sectional and longitudinal associations of psychosocial well-being with sleep duration and sleep disturbances. For the cross-sectional analysis, we used data of 3-15-year-old children and adolescents participating in the 2013/14 examination of the European IDEFICS/I...
January 4, 2019: Journal of Sleep Research
Joseph M Dzierzewski, Jennifer L Martin, Constance H Fung, Yeonsu Song, Lavinia Fiorentino, Stella Jouldjian, Juan Carlos Rodriguez, Michael Mitchell, Karen Josephson, Cathy A Alessi
Subjective and objective estimates of sleep are often discordant among individuals with insomnia who typically under-report sleep time and over-report wake time at night. This study examined the impact and durability of cognitive-behavioural therapy for insomnia on improving the accuracy of sleep and wake perceptions in older adults, and tested whether changes in sleep quality were related to changes in the accuracy of sleep/wake perceptions. One-hundred and fifty-nine older veterans (97% male, mean age 72...
January 4, 2019: Journal of Sleep Research
Corina Anastasaki, Nicholas Rensing, Kevin J Johnson, Michael Wong, David H Gutmann
Neurofibromatosis type 1 (NF1) is a neurodevelopmental disorder in which affected children and adults are at a higher risk of sleep disorders. In an effort to identify potential sleep disturbances in a small animal model, we used a previously reported Nf1 conditional knockout (Nf1CKO ) mouse strain. In contrast to Nf1 mutant flies, the distribution of vigilance states was intact in Nf1CKO mice. However, Nf1CKO mice exhibited increased non-REM sleep (NREM)-to-wake and wake-to-NREM transitions. This sleep disruption was accompanied by decreased bout durations during awake and NREM sleep states under both light and dark conditions...
January 4, 2019: Journal of Sleep Research
Francisco Campos-Rodriguez, Cristina Navarro-Soriano, Nuria Reyes-Nuñez, Gerard Torres, Candela Caballero-Eraso, Patricia Lloberes, Trinidad Diaz-Cambriles, Maria Somoza, Juan F Masa, Monica Gonzalez, Eva Mañas, Monica de la Peña, Ferran Barbe, Francisco Garcia-Rio, Josep Maria Montserrat, Alfonso Muriel, Alberto Garcia-Ortega, Maria J Selma, Miguel-Angel Martinez-Garcia
Although adequate adherence is paramount in achieving the beneficial effects of continuous positive airway pressure therapy in patients with obstructive sleep apnea, long-term adherence and the variables involved in continuous positive airway pressure compliance in patients with resistant hypertension and obstructive sleep apnea are yet unknown. We conducted a prospective, multicentre, observational study in 177 patients recruited from hypertensive units with resistant hypertension confirmed by means of 24-hr blood pressure monitoring (blood pressure ≥ 130 and/or ≥ 80 mmHg, despite taking at least three antihypertensive drugs or < 130/80 mmHg with > 3 drugs) and obstructive sleep apnea (apnea-hypopnea index ≥ 5 in a respiratory polygraph) who were prescribed continuous positive airway pressure treatment...
January 2, 2019: Journal of Sleep Research
Johanna Schwarz, John Axelsson, Andreas Gerhardsson, Sandra Tamm, Håkan Fischer, Göran Kecklund, Torbjörn Åkerstedt
Sleep deprivation commonly impairs affective regulation and causes worse mood. However, the majority of previous research concerns young adults. Because susceptibility to sleep deprivation and emotion regulation change distinctively across adult age, we tested here the hypothesis that the effect of sleep deprivation on mood is stronger in young than in older adults. In an experimental design, young (18-30 years) and older adults (60-72 years) participated in either a sleep control (young, n = 63; older, n = 47) or a total sleep deprivation condition (young, n = 61; older, n = 47)...
December 25, 2018: Journal of Sleep Research
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