Relationship between chronotype and quality of sleep in medical students at the Federal University of Paraiba, Brazil

Rique, Gabriela Lemos Negri; Filho, Gilson Mauro Costa Fernandes; Ferreira, Amanda Dantas Cavalcante; Sousa-Muñoz, Rilva Lopes de

doi:10.1016/j.slsci.2014.09.004

Cited by 91 publications

(88 citation statements)

References 44 publications

(61 reference statements)

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“…The sleep duration of students in our study was short; this is in line with the results of previous studies, which reported that the sleep duration of Japanese university students was shorter than those of university students in other countries [1]. In the present study, the prevalence of evening-type individuals (16%) was lower than that of previous studies, which reported results that ranged from 20 to 35% [41][42][43]. Multiple imputation by chained equations with a five-imputation dataset was performed for missing data…”

Section: Insomnia Insufficient Sleep and Delayed Sleep-wake Phase Insupporting

confidence: 90%

Impact of sleep problems on daytime function in school life: a cross-sectional study involving Japanese university students

et al. 2020

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Background: The aims of this study were 1) to clarify the prevalence of sleep problems (insomnia, insufficient sleep, and delayed sleep-wake phase) among Japanese university students; 2) to examine sociodemographic characteristics, lifestyle, and sleep-related symptoms in each sleep problem; and 3) to evaluate the association between the above-mentioned sleep problems and daytime dysfunction in school life. Methods: Self-report questionnaire surveys were conducted at eight universities in Japan, and we received 1034 valid answers (78% female). The questionnaire consisted of socio-demographic characteristics, information on lifestyle, sleep pattern, sleep-related symptoms, and daytime dysfunction in school life. Groups with insomnia, behaviorally induced insufficient sleep syndrome (BIISS), delayed sleep-wake phase (DSWP), and BIISS + DSWP were defined. To identify the association between sleep problems and daytime dysfunction in school life, the generalized linear mixed effect model was conducted. Results: Sleep duration on weekdays was 5.9 ± 1.2 h, and 38.2% of the students had a sleep duration < 6.0 h. About 16% of the students were categorized as evening-type individuals. More than half of the students (56.1%) had excessive daytime sleepiness. Insomnia was associated with tardiness (aOR: 0.8, 95%CI: 0.7-0.9) and falling asleep during class (aOR: 1.6: 95%CI: 1.4-2.0). BIISS was associated with tardiness (aOR: 1.5, 95%CI: 1.1-2.2) and interference with academic achievement (aOR: 1.9, 95%CI: 1.3-2.6). DSWP and BIISS + DSWP were associated with absence (aOR: 3.4, 95%CI: 2.2-5.1 / aOR: 4.2, 95%CI: 3.2-5.6), tardiness (aOR: 2.7, 95%CI: 1.8-4.

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Section: Insomnia Insufficient Sleep and Delayed Sleep-wake Phase Insupporting

confidence: 90%

Impact of sleep problems on daytime function in school life: a cross-sectional study involving Japanese university students

et al. 2020

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“…Last part of SDQ, Epworth sleepiness score consists of 8 items about probability of sleeping in different situations, which ranges from 0 (never) to 3 (high chance of dozing). The total score of ESS considered in a scale of 0-24, so final grade class has been calculated as 3-9 (Normal), 10-13 (mild), 14-19 (moderate) and 20-24 (severe sleepiness) 20,21 The validity of the questionnaire has been established in previous studies. 22 In this study, the internal reliability of Cronbach Alpha was 0.86.…”

Section: Methodsmentioning

confidence: 99%

Relationship between Sleep Disorders, Pain and Quality of Life in Patients with Rheumatoid Arthritis

et al. 2015

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“…They typically wake up later than the morning chronotype people ("larks"). Evening chronotype people have poorer sleep quality and lower professional performance [65], higher mortality and reduced longevity [66].…”

Section: Too Much Rem Sleepmentioning

confidence: 99%

Mechanisms of Association of Sleep and Metabolic Syndrome

Smiley¹,

Wolter²,

Nissan³

2019

J Med - Clin Res & Rev

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There is a U-shaped association between sleep duration and risk of metabolic syndrome. The related mechanisms can be grouped into two categories: I. Too little slow-wave sleep; II. Too much REM sleep. Too little slow-wave sleep. 1) Stage 3 is the most crucial sleep stage because growth hormone (GH) and GH releasing hormone (GHRH) are released during this stage. They induce fat burning, bone building, and general repair and regeneration. The greater the volume of GH and GHRH released, the more restorative the sleep. The longest part of stage 3 in sleep takes place before midnight. Delayed sleep onset until midnight or later, would suppress the largest GH pulse. 2) Sleep restriction induces high levels of ghrelin and low levels of leptin. Ghrelin stimulates appetite whereas leptin does the reverse. 3) Advanced glycation end products (AGEs) are significantly increased in chronic sleep insufficiency and are also associated with insulin resistance in males with chronic sleep insufficiency. 4) Sleep insufficiency increases sympathetic activity and pro-inflammatory cytokines, both of which increase insulin resistance. 5) Accumulations of extracellular β amyloid protein plaques and intracellular tau neurofibrillary tangles in brain tissues start immediately after one night of sleep insufficiency. These plaques and tangles are neurotoxins that potentiate each other's destructive effects on the structures and functions of brain cells and cause neuronal death. The consequence is a global decrease in cognition and decision making, manifested in increased consumption of fatty foods and unhealthy snacks in late sleepers. 6) High levels of β amyloid and proteins might lead to sleep fragmentation, worsening of sleep quality and daytime somnolence. Concentration will be more difficult, and performance will be reduced. 7) Astrocytes are special giant cells in brain interstitial fluids that play a major role in β amyloid and tau cleanup. Their activity is increased by growth hormone. As a result, slow-wave sleep insufficiency may lead to impaired peripheral clearance of β amyloid and tau proteins predisposing the brain to Alzheimer's disease. Too much REM sleep. 1) The REM stage is the dreaming stage. The level of cortisol starts to rise in the middle of night based on circadian rhythm, and peaks in the morning. Cortisol is the fight or flight hormone, equipping the individual both to meet the demands of daily life and to handle stressful situations. It stimulates the release of epinephrine and norepinephrine. These hormones increase heart rate and blood pressure as they prepare the body to initiate activity quickly. These reactions occur on top of heart rate variability and a rise in blood pressure induced by REM sleep. If the individual wakes up early in the morning, he will use the cortisol properly to prepare for the new day. If instead he or she remains asleep, there will be no physical activity, and the cortisol levels that are normal for a person who is awake will be high levels for the one who is asleep. Then, the sleeper m...

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Relationship between chronotype and quality of sleep in medical students at the Federal University of Paraiba, Brazil

Cited by 91 publications

References 44 publications

Impact of sleep problems on daytime function in school life: a cross-sectional study involving Japanese university students

Impact of sleep problems on daytime function in school life: a cross-sectional study involving Japanese university students

Relationship between Sleep Disorders, Pain and Quality of Life in Patients with Rheumatoid Arthritis

Mechanisms of Association of Sleep and Metabolic Syndrome

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