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Sleep Science

Clarissa Bueno, Luiz Menna-Barreto
Photic and non-photic environmental factors are suggested to modulate the development of circadian rhythms in infants. Our aim is to evaluate the development of biological rhythms (circadian or ultradian) in newborns in transition from Neonatal Intensive Care Units (NICU) to home and along the first 6 months of life, to identify masking and entraining environment factors along development. Ten newborns were evaluated in their last week inside the NICU and in the first week after being delivered home; 6 babies were also followed until 6 months of corrected age...
October 2016: Sleep Science
Andressa Juliane Martins, Suleima Pedroza Vasconcelos, Debra Jean Skene, Arne Lowden, Claudia Roberta de Castro Moreno
Physical activity has been recommended as a strategy for improving sleep. Nevertheless, physical effort at work might not be not the ideal type of activity to promote sleep quality. The aim of this study was to evaluate the effects of type of job (low vs. high physical effort) and life-style on sleep of workers from an Amazonian Extractivist Reserve, Brazil. A cross-sectional study of 148 low physical activity (factory workers) and 340 high physical activity (rubber tappers) was conducted between September and November 2011...
October 2016: Sleep Science
Manuel Ángeles-Castellanos, Fátima Ramírez-Gonzalez, Laura Ubaldo-Reyes, Oscar Rodriguez-Mayoral, Carolina Escobar
Delirium is associated with circadian rhythm disruption. In this study we have explored whether circadian variation of melatonin is an indicator for delirium. Melatonin levels were determined from the first day of hospitalization and up to three days after the onset of delirium. Patients who did not developed delirium exhibited a daily melatonin rhythm, while in patients that developed delirium, the melatonin rhythm was lost and mean melatonin levels were found decreased as early as three days before the diagnosis of delirium, indicating that on arrival to the hospital circadian melatonin disruption can be used as an indicator of delirium...
October 2016: Sleep Science
Barbara Mizumo Tomotani, Juan Pablo Amaya, Gisele Akemi Oda, Veronica Sandra Valentinuzzi
South American subterranean rodents are mainly described as solitary and mutual synchronization was never observed among individuals maintained together in laboratory. We report that a single birth event was capable of disrupting the robust nocturnal activity rhythm of singly housed tuco-tucos from north-west Argentina. "Around-the-clock activity" was displayed by 8 out of 13 animals whose cages were closer to the newborn pups. However, experimental exposure to a pup vocalization did not produce a similar effect on the rhythms of adult animals...
October 2016: Sleep Science
Giannina J Bellone, Santiago A Plano, Daniel P Cardinali, Daniel Pérez Chada, Daniel E Vigo, Diego A Golombek
Sleep-related health disorders are increasing worldwide; diagnosis and treatment of such sleep diseases are commonly invasive and sometimes unpractical or expensive. Actigraphy has been recently introduced as a tool for the study of sleep and circadian disorders; however, there are several devices that claim to be useful for research and have not been thoroughly tested. This comparative study provides activity, sleep and temperature information regarding several of the most commonly used actigraphers: Micro-Mini Motion Logger; Act Trust; Misfit Flash; Fitbit Flex & Thermochron...
October 2016: Sleep Science
Magna Lúcia de Souza Palmeira, Elaine Cristina Marqueze
OBJECTIVE: To identify the prevalence and associated factors of overweight and obesity in Brazilian commercial airline pilots. Methods An observational, cross-sectional study involving 1198 Brazilian commercial airline pilots with a sampling power >80% (ß=20%) and confidence level of 95% (α=5%) was carried out. The pilots completed an on-line questionnaire collecting data on sociodemographics, work, health, lifestyle and sleep. Poisson regression, with robust variance (stepwise forward technique), was employed to analyze the factors associated with excess weight (overweight and obesity)...
October 2016: Sleep Science
Flávia Cal Sabino, José Américo de Oliveira, Mario Pedrazzoli
We present a study of Per3 expression in six different tissues of the non-human primate Cebus apella (capuchin monkey). The aim of this study was to verify whether the expression of the Per3 gene in different tissues of capuchin monkey occurs in a circadian pattern, its phase and the phase relationships between these different tissues during the 24 h of a day. We observed that gene expression oscillated in all of the tissues studied during this time period, although only the liver and muscle presented a robust circadian pattern...
October 2016: Sleep Science
Luiz Menna-Barreto
No abstract text is available yet for this article.
October 2016: Sleep Science
Amir Rezaei Ardani, Seyyed Ali Saghebi, Mahsa Nahidi, Farzaneh Zeynalian
BACKGROUND AND OBJECTIVE: Among substances that have a significant effect on sleep are stimulants, including amphetamines. As there are few studies assessing sleep quality in methamphetamine withdrawal this study aims to evaluate changes in sleep quality of methamphetamine dependent patients during early remission period by controlling depression and anxiety as confounding variables. METHODS: This study was conducted in Mashhad, Iran. Ninety amphetamine dependent patients, who were admitted in residential centers during 2012-2014 and met our inclusion criteria, were chosen by purposive nonprobability sampling method...
July 2016: Sleep Science
Syaron Basnet, Ilona Merikanto, Tuuli Lahti, Satu Männistö, Tiina Laatikainen, Erkki Vartiainen, Timo Partonen
A cross-sectional population-based survey, the National FINRISK 2012 Study, designed to monitor chronic diseases and their risk factors in Finland. A random sample of 10,000 adults aged 25-74 years, and of them, 64% (n=6424) participated the study. Participants subjectively reported the total durations for sleep and naps (n=6238), sleep quality (n=5878), bedtimes and wake-up times separately for working days and weekends yielding the amount of sleep debt (n=5878), and the seasonal variation in sleep duration (n=4852)...
July 2016: Sleep Science
Eduardo Borsini, Magali Blanco, Martin Bosio, Di Tullio Fernando, Glenda Ernst, Alejandro Salvado
INTRODUCTION: Obstructive sleep apnea syndrome (OSA) is diagnosed through polysomnography (PSG) or respiratory polygraphy (RP). Self-administered home-based RP using devices with data transmission could facilitate diagnosis in distant populations. The purpose of this work was to describe a telemedicine initiative using RP in four satellite outpatient care clinics (OCC) of Buenos Aires Hospital Británico Central (HBC). MATERIALS AND METHODS: OCC technicians were trained both in the use of RP...
July 2016: Sleep Science
J Olakunle Onaolapo, Y Adejoke Onaolapo, A Moses Akanmu, Gbola Olayiwola
OBJECTIVES: Effects of daily caffeine consumption on open-field behaviours, serum corticosterone and brain antioxidant levels were investigated after six hours of total sleep-deprivation in prepubertal mice. We tested the hypothesis that daily caffeine consumption may significantly alter behaviour, stress and antioxidative response of prepubertal mice to an acute episode of total sleep-deprivation. METHODS: Prepubertal Swiss mice of both sexes were assigned to two main groups of 120 each (subdivided into 6 groups of 10 each, based on sex), and administered vehicle or graded oral doses of caffeine (10, 20, 40, 80 and 120 mg/kg/day) for 14 days...
July 2016: Sleep Science
Fabio Santos Lira, Andrea Maculano Esteves, Gustavo Duarte Pimentel, José Cesar Rosa, Miriam Kannebley Frank, Melise Oliveira Mariano, Josiane Budni, João Quevedo, Ronaldo Vagner Dos Santos, Marco Túlio de Mello
PURPOSE: We sought explore the effects of doxorubicin on sleep patterns and locomotor activity. To investigate these effects, two groups were formed: a control group and a Doxorubicin (DOXO) group. METHODS: Sixteen rats were randomly assigned to either the control or DOXO groups. The sleep patterns were examined by polysomnographic recording and locomotor activity was evaluated in an open-field test. RESULTS: In the light period, the total sleep time and slow wave sleep were decreased, while the wake after sleep onset and arousal were increased in the DOXO group compared with the control group (p<0...
July 2016: Sleep Science
Silvana Valera, Veronica Guadagni, Edward Slone, Ford Burles, Michele Ferrara, Tavis Campbell, Giuseppe Iaria
Sleep is well known to have a significant impact on learning and memory. Specifically, studies adopting an experimentally induced sleep loss protocol in healthy individuals have provided evidence that the consolidation of spatial memories, as acquired through navigating and orienteering in spatial surroundings, is negatively affected by total sleep loss. Here, we used both objective and subjective measures to characterize individuals' quality of sleep, and grouped participants into either a poor (insomnia-like) or normal (control) sleep quality group...
July 2016: Sleep Science
Emma García-Campos, Alberto Labra, Lourdes Galicia-Polo, Francisco Sánchez-Narváez, Reyes Haro, Ulises Jiménez, Adrián Poblano
INTRODUCTION: Mandibular advancement device (MAD) may represent a feasible choice in the treatment of obstructive sleep apnea-hypopnea syndrome (OSAHS), in well selected patients. OBJECTIVE: The aim of this study is to assess the efficacy of MAD in patients with OSAHS, using split night polysomnography (SNP). METHOD: We performed an auto controlled clinical trial to assess the efficacy of MAD in 30 patients with snoring and OSAHS. Clinical evaluation was made every 2 weeks to adjust treatment and observe changes in clinical symptoms...
July 2016: Sleep Science
Karen A Fernández-Cruz, Ulises Jiménez-Correa, Hernán A Marín-Agudelo, Claudio Castro-López, Adrián Poblano
INTRODUCTION: The aim of the study was to propose the Clinical Inventory of Sleep Quality (CISQ), and compared it with the Pittsburgh sleep quality index (PSQI). METHODS: We studied 400 subjects with the CISQ. Cronbach's alpha coefficient was calculated to measure the reliability, and to determine the concurrent validity, a Canonical correlation analysis was performed. At next, we used an exploratory and confirmatory Factorial analysis with Varimax rotation for validity construct calculation...
July 2016: Sleep Science
Zi-Jian Cai
Many observations have demonstrated that the hypothalamic neuroendocrine change determines the chronological sequence of aging in mammals. However, it remains uncertain on the mechanism to account for the hypothalamic aging manifestations. In this article, it is pointed out that, as constantly exposed to sunshine and oxygen, the skin would undergo both telomere-shortening and oxidative senescent processes. The senescent alterations of skin, such as attenuation in electrodermal activities, would in turn reduce the emotional responses and memories...
July 2016: Sleep Science
Arbind Kumar Choudhary, Sadawarte Sahebrao Kishanrao, Anup Kumar Dadarao Dhanvijay, Tanwir Alam
Sleepiness is the condition where for some reason fails to go into a sleep state and will have difficulty in remaining awake even while carrying out activities. Sleep restriction occurs when an individual fails to get enough sleep due to high work demands. The mechanism between sleep restriction and underlying brain physiology deficits is not well assumed. The objective of the present study was to investigate the mental attention (P300) and reaction time [visual (VRT) and auditory (ART)] among night watchmen, at subsequent; first (1st) day, fourth (4th) day and seventh (7th) day of restricted sleep period...
July 2016: Sleep Science
Matthias J Müller, Christiane Olschinski, Bernd Kundermann, Nicole Cabanel
Sleep complaints and sleep disturbances are highly prevalent in patients with psychiatric disorders. During hospitalization the patients' condition may be even worse but little is known about the subjective sleep quality in psychiatric hospitals. Thus, we have investigated subjective sleep quality and mean sleep duration in patients with different psychiatric disorders at the end of hospitalization. For a period of one year, inpatients of a psychiatric hospital with diagnosis of substance use disorder (SUD), schizophrenia (SCZ), or anxiety/depressive disorders (AND) were routinely asked to fill in an easily comprehensible sleep quality questionnaire at the end of their hospitalization...
July 2016: Sleep Science
Matthew Driller, Joseph McQuillan, Shannon O'Donnell
Actigraphy has become a common method of measuring sleep due to its non-invasive, cost-effective nature. An actigraph (Readiband™) that utilizes automatic scoring algorithms has been used in the research, but is yet to be evaluated for its inter-device reliability. A total of 77 nights of sleep data from 11 healthy adult participants was collected while participants were concomitantly wearing two Readiband™ actigraphs attached together (ACT1 and ACT2). Sleep indices including total sleep time (TST), sleep latency (SL), sleep efficiency (SE%), wake after sleep onset (WASO), total time in bed (TTB), wake episodes per night (WE), sleep onset variance (SOV) and wake variance (WV) were assessed between the two devices using mean differences, 95% levels of agreement, intraclass correlation coefficients (ICC), typical error of measurement (TEM) and coefficient of variation (CV%) analysis...
July 2016: Sleep Science
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