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Journal of Sleep Research

Torbjörn Åkerstedt, Francesca Ghilotti, Alessandra Grotta, Hongwei Zhao, Hans-Olov Adami, Ylva Trolle-Lagerros, Rino Bellocco
Previous studies have found a U-shaped relationship between mortality and (weekday) sleep duration. We here address the association of both weekday and weekend sleep duration with overall mortality. A cohort of 43,880 subjects was followed for 13 years through record-linkages. Cox proportional hazards regression models with attained age as time-scale were fitted to estimate multivariable-adjusted hazard ratios and 95% confidence intervals for mortality; stratified analyses on age (<65 years, ≥65 years) were conducted...
May 22, 2018: Journal of Sleep Research
Jesús Castro-Marrero, Maria C Zaragozá, Sergio González-Garcia, Luisa Aliste, Naia Sáez-Francàs, Odile Romero, Alex Ferré, Tomás Fernández de Sevilla, José Alegre
Non-restorative sleep is a hallmark symptom of chronic fatigue syndrome/myalgic encephalomyelitis. However, little is known about self-reported sleep disturbances in these subjects. This study aimed to assess the self-reported sleep quality and its impact on quality of life in a Spanish community-based chronic fatigue syndrome/myalgic encephalomyelitis cohort. A prospective cross-sectional cohort study was conducted in 1,455 Spanish chronic fatigue syndrome/myalgic encephalomyelitis patients. Sleep quality, fatigue, pain, functional capacity impairment, psychopathological status, anxiety/depression and health-related quality of life were assessed using validated subjective measures...
May 16, 2018: Journal of Sleep Research
Ryan P Sixtus, Barbara C Galland, James D Cotter
Temperature of the skin (TSk ) and core (TC ) play key roles in sleep-wake regulation. The diurnal combination of low TSk and high TC facilitates alertness, whereas the transition to high TSk and low TC correlates with sleepiness. Sleepiness and deteriorating vigilance are induced with peripheral warming, whereas peripheral cooling appears to transiently improve vigilance in narcolepsy. This study aimed to test the hypothesis that foot cooling would maintain vigilance during extended wakefulness in healthy adults...
May 10, 2018: Journal of Sleep Research
Xiao Tan, Jonathan Cedernaes, Lars A Forsberg, Helgi B Schiöth, Christian Benedict
The present study, with an observational period of about 40 years, examined the association between self-reported sleep disturbances (i.e. problems with falling and staying asleep; use of hypnotics) and prostate cancer morbidity and mortality in initially 2322 men (all 50 years old at baseline). Self-reported sleep disturbances and established risk factors (e.g. age, lower urinary tract symptoms, smoking and family history of cancer) were measured at ages 50 and 70 years. Information about prostate cancer diagnosis and deaths as a result of prostate cancer was available from the National Cancer Registry and the Swedish Civil Registry of Morbidity...
May 8, 2018: Journal of Sleep Research
Chelsea M Reynolds, Michael Gradisar, Michelle A Short
Evidence of night-to-night variation in adolescent sleep spindle characteristics is lacking. Twelve adolescents (M = 15.8 ± 0.8 years, eight males) participated in a laboratory study involving 9 nights with 10 hr sleep opportunity. Sleep electroencephalograph was analysed and intra-class coefficients calculated to determine the reliability of sleep spindles across multiple nights of recording. Slow spindle amplitude and fast spindle density, duration and amplitude characteristics all had acceptable reliability within a single night of sleep recording...
May 7, 2018: Journal of Sleep Research
Marion Kuhn, Elisabeth Hertenstein, Bernd Feige, Nina Landmann, Kai Spiegelhalder, Chiara Baglioni, Johanna Hemmerling, Diana Durand, Lukas Frase, Stefan Klöppel, Dieter Riemann, Christoph Nissen
Healthy sleep restores the brain's ability to adapt to novel input through memory formation based on activity-dependent refinements of the strength of neural transmission across synapses (synaptic plasticity). In line with this framework, patients with primary insomnia often report subjective memory impairment. However, investigations of memory performance did not produce conclusive results. The aim of this study was to further investigate memory performance in patients with primary insomnia in comparison to healthy controls, using two well-characterized learning tasks, a declarative virtual water maze task and emotional fear conditioning...
May 2, 2018: Journal of Sleep Research
Isabel Morales-Muñoz, Outi Saarenpää-Heikkilä, Anneli Kylliäinen, Pirjo Pölkki, Tarja Porkka-Heiskanen, Tiina Paunio, E Juulia Paavonen
Sleep problems in young children are among the most common concerns reported to paediatricians. Sleep is thought to have important regulatory functions, and sleep difficulties in early childhood are linked to several psychosocial and physiological problems. Moreover, several prenatal factors have been found to influence infants' sleep. Among them, most of the studies have been focused on maternal prenatal depression and/or anxiety as potential risk factors for sleep problems in childhood, whereas other relevant psychological factors during pregnancy have not received as much attention...
May 2, 2018: Journal of Sleep Research
Elisabeth Taylor, Irene Zeng, Conor O'Dochartaigh
Despite the Epworth Sleepiness Score being widely used, there are limited studies of its reliability in clinical practice. The aim of this study was to assess the reliability of the Epworth Sleepiness Score in a clinical population. The study included patients referred to Middlemore Hospital sleep service between October and November 2014, aged over 17 years, with at least two Epworth Sleepiness Score measurements at up to three different points on the diagnostic pathway: on General Practitioner referral (GP Epworth Sleepiness Score); at overnight oximetry assessment (Oximetry Epworth Sleepiness Score); and at a specialist clinic (Specialist Epworth Sleepiness Score)...
May 2, 2018: Journal of Sleep Research
Anne Herlan, Jörg Ottenbacher, Johannes Schneider, Dieter Riemann, Bernd Feige
As the prevalence of sleep disorders is increasing, new methods for ambulatory sleep measurement are required. This paper presents electrodermal activity in different sleep stages and a sleep detection algorithm based on electrodermal activity. We analysed electrodermal activity and polysomnographic data of 43 healthy subjects and 48 patients with sleep disorders. Electrodermal activity was measured using an ambulatory device worn at the wrist. Two parameters to describe electrodermal activity were defined based on previous literature: EDASEF (electrodermal activity-smoothed feature) as parameter for skin conductance level; and EDAcounts (number of electrodermal activity-peaks) as skin conductance responses...
May 2, 2018: Journal of Sleep Research
Madeline Sprajcer, Sarah M Jay, Grace E Vincent, Andrew Vakulin, Leon Lack, Sally A Ferguson
On-call work is used to manage around the clock working requirements in a variety of industries. Often, tasks that must be performed while on-call are highly important, difficult and/or stressful by nature and, as such, may impact the level of anxiety that is experienced by on-call workers. Heightened anxiety is associated with poor sleep, which affects next-day cognitive performance. Twenty-four male participants (20-35 years old) spent an adaptation, a control and two counterbalanced on-call nights in a time-isolated sleep laboratory...
April 22, 2018: Journal of Sleep Research
Asmaa M Abumuamar, Paul Dorian, David Newman, Colin M Shapiro
Obstructive sleep apnea (OSA) is a sleep disorder associated with significant cardiovascular comorbidities, including cardiac arrhythmia. The STOP-BANG questionnaire is an eight-item self-report questionnaire designed to screen patients for OSA and was validated in preoperative surgical patients. The STOP items are snoring, daytime tiredness, observed apneas and high blood pressure. The BANG items are body mass index >35 kg/m2 , age >50 years, neck circumference >40 cm and male gender. We aimed to determine the screening properties of the STOP-BANG questionnaire in patients with arrhythmia...
April 22, 2018: Journal of Sleep Research
Jorien L Treur, Mark Gibson, Amy E Taylor, Peter J Rogers, Marcus R Munafò
Observationally, higher caffeine consumption is associated with poorer sleep and insomnia. We investigated whether these associations are a result of shared genetic risk factors and/or (possibly bidirectional) causal effects. Summary-level data were available from genome-wide association studies on caffeine intake (n = 91 462), plasma caffeine and caffeine metabolic rate (n = 9876), sleep duration and chronotype (being a "morning" versus an "evening" person) (n = 128 266), and insomnia complaints (n = 113 006)...
April 22, 2018: Journal of Sleep Research
Jean-Baptiste Eichenlaub, Elaine van Rijn, Mairéad Phelan, Larnia Ryder, M Gareth Gaskell, Penelope A Lewis, Matthew P Walker, Mark Blagrove
Incorporation of details from waking life events into rapid eye movement (REM) sleep dreams has been found to be highest on the 2 nights after, and then 5-7 nights after, the event. These are termed, respectively, the day-residue and dream-lag effects. This study is the first to categorize types of waking life experiences and compare their incorporation into dreams across multiple successive nights. Thirty-eight participants completed a daily diary each evening and a dream diary each morning for 14 days. In the daily diary, three categories of experiences were reported: major daily activities (MDAs), personally significant events (PSEs) and major concerns (MCs)...
April 22, 2018: Journal of Sleep Research
Franco Gemignani
No abstract text is available yet for this article.
April 22, 2018: Journal of Sleep Research
Ellemarije Altena, Yannick Daviaux, Ernesto Sanz-Arigita, Emilien Bonhomme, Étienne de Sevin, Jean-Arthur Micoulaud-Franchi, Stéphanie Bioulac, Pierre Philip
Virtual reality and simulation tools enable us to assess daytime functioning in environments that simulate real life as close as possible. Simulator sickness, however, poses a problem in the application of these tools, and has been related to pre-existing health problems. How sleep problems contribute to simulator sickness has not yet been investigated. In the current study, 20 female chronic insomnia patients and 32 female age-matched controls drove in a driving simulator covering realistic city, country and highway scenes...
April 17, 2018: Journal of Sleep Research
Elisabeth Groos, Charlotte Chaumereuil, Mathilde Flamand, Agnes Brion, Hubert Bourdin, Vanessa Slimani, Michel Lecendreux, Isabelle Arnulf
In Kleine-Levin syndrome (KLS), episodes of hypersomnia and cognitive, psychiatric and behavioural disturbances alternate with asymptomatic periods in adolescents. We evaluated whether psychiatric disorders would emerge during asymptomatic periods in a naturalistic, uncontrolled clinical cohort. Patients with primary KLS underwent psychiatric interviews at diagnosis and every year for 1-10 years, leading to diagnosis of former and present comorbid psychiatric disorders. Among the 115 patients (65.2% male and aged 16...
April 14, 2018: Journal of Sleep Research
Liisa Kuula, Ilona Merikanto, Tommi Makkonen, Risto Halonen, Marius Lahti-Pulkkinen, Jari Lahti, Kati Heinonen, Katri Räikkönen, Anu-Katriina Pesonen
Research suggests an association between schizophrenia and a decrease in sleep spindle activity, as well as a change in sleep architecture. It is unknown how the continuum of psychotic symptoms relates to different features in the sleep electroencephalogram. We set out to examine how sleep architecture and stage 2 spindle activity are associated with schizotypy in a healthy adolescent population. The participants in our study (n = 176, 61% girls) came from a community-based cohort. Schizotypal traits were evaluated using the Schizotypal Personality Scale (STA) in early adolescence (mean age 12...
April 14, 2018: Journal of Sleep Research
Ester London, Carlos H F Camargo, Alessandra Zanatta, Ana C Crippa, Salmo Raskin, Renato P Munhoz, Tetsuo Ashizawa, Hélio A G Teive
As sleep disturbances have been reported in spinocerebellar ataxias (SCAs), including types SCA1, SCA2, SCA3, SCA6 and SCA13, identification and management of these disturbances can help minimise their impact on SCA patients' overall body functions and quality of life. To our knowledge, there are no studies that investigate sleep disturbances in SCA10. Therefore, the aim of this study was to assess sleep disturbances in patients with SCA10. Twenty-three SCA10 patients and 23 healthy controls were recruited...
April 6, 2018: Journal of Sleep Research
Caroline Maness, Prabhjyot Saini, Donald L Bliwise, Victoria Olvera, David B Rye, Lynn M Trotti
Symptoms of the central disorders of hypersomnolence extend beyond excessive daytime sleepiness to include non-restorative sleep, fatigue and cognitive dysfunction. They share much in common with myalgic encephalomyelitis/chronic fatigue syndrome, recently renamed systemic exertion intolerance disease, whose additional features include post-exertional malaise and orthostatic intolerance. We sought to determine the frequency and correlates of systemic exertion intolerance disease in a hypersomnolent population...
April 6, 2018: Journal of Sleep Research
Hasan Zare Khormizi, Mohammad Ali Salehinejad, Michael A Nitsche, Vahid Nejati
Negative effects of sleep deprivation on different types of memory are well documented, but the specific effects on autobiographical memory performance are not well studied. In this study, we investigated performance on the autobiographical memory test in a group of sleep-deprived and well-rested nurses. One-hundred participants divided into sleep-deprived (N = 50, 25 females) and well-rested (N = 50, 25 females) groups took part in the study. The sleep-deprived group included night-shift nurses with 8-12 hr sleep deprivation, while the well-rested group had the usual night sleep before performance assessment...
April 6, 2018: Journal of Sleep Research
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