Seasonal variation and sleep patterns in a hot climate Arab Region

Lawati, Ibtisam Al; Zadjali, Fahad; Abri, Mohammed Al

doi:10.1007/s11325-022-02620-3

Cited by 4 publications

(2 citation statements)

References 30 publications

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“…This cross-sectional descriptive study was conducted among the Arab population in Oman using an objective method of actigraphy to measure sleep duration and timing. We have indicated earlier that people in Oman and other similar communities have different sleep patterns which involve habitually long afternoon napping that may extend to more than 1 h ( 15 , 23 , 28 ). The current study indicated that long afternoon napping of more than 60 min is associated with increased glycated hemoglobin (HbA1C) and obesity in subjects with normal nocturnal sleep duration.…”

Section: Discussionmentioning

confidence: 99%

“…All potential confounders were also identified a priori and that include age, gender, diet, level of exercise, level of education, and socioeconomic status, all of which are known to be risk factors for cardiometabolic diseases and it is already reported in previously published articles ( 15 , 23 ). All participants reported a carbohydrate-rich diet and no or mild (one episode of walking/ week) exercise.…”

Section: Methodsmentioning

confidence: 99%

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Association of elevated glycated hemoglobin and obesity with afternoon napping for more than 1 h in young and middle-aged healthy adults

2022

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IntroductionSleep has different patterns followed worldwide and can be influenced by social, cultural, and environmental factors. Daytime napping is commonly practiced in different parts of the world with controversial results of its effect on glucose metabolism. The current study aims to examine the association of afternoon napping and night sleep duration with metabolic derangements.MethodsThis is a cross-sectional study involving young adults and middle-aged subjects. Anthropometric measurements were taken for height and weight and hip and waist ratio. Consented subjects were asked to wear actigraphy for 1 week and run their usual daily activities. Home sleep apnea testing was performed to exclude obstructive sleep apnea. Subjects had been asked to come fasting on day seven for blood collection to test for fasting glucose, glycated hemoglobin, lipid profile, and insulin.ResultsA total of 405 subjects were involved to complete the study (52% male, 48% female). The mean age of participants was 32.8 ± 11.5 years. The study indicated that the duration of afternoon napping was significantly associated with abnormal glycated hemoglobin (HbA1c > 5.7%) (p = 0.01) and body mass index (p = 0.046) independent of age, gender, and nocturnal sleep duration. Nocturnal sleep duration was associated with increased insulin level (p = 0.04).ConclusionAfternoon napping is associated with an increased level of glycated hemoglobin and obesity and that may predispose to the development of type 2 diabetes mellitus.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Association of elevated glycated hemoglobin and obesity with afternoon napping for more than 1 h in young and middle-aged healthy adults

2022

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Individual sleep need is flexible and dynamically related to cognitive function

Fjell,

Walhovd

2024

Nat Hum Behav

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Variability of excessive daytime sleepiness and cataplexy according to seasonality: A study in central disorders of hypersomnolence

Cirillo,

Fernandes,

Placidi

et al. 2025

Journal of Sleep Research

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SummarySeasonality of excessive daytime sleepiness has been proposed, yet no research has specifically investigated its impact on daytime sleepiness and cataplexy in central disorders of hypersomnolence. This study examined seasonal variations in daytime sleepiness and cataplexy in narcolepsy type 1, narcolepsy type 2 and idiopathic hypersomnia. Patients included in the study were on stable pharmacological treatment, and participated in sleep medicine interviews to assess diurnal sleepiness and daytime napping and completed the Epworth Sleepiness Scale to assess excessive daytime sleepiness (Epworth Sleepiness Scale ≥ 10). Patients with narcolepsy type 1 also maintained a cataplexy diary. Evaluations were conducted in autumn, winter, spring and summer. The study included 29 patients with narcolepsy type 1, 16 patients with narcolepsy type 2 and 10 patients with idiopathic hypersomnia. Patients with narcolepsy type 1 and narcolepsy type 2 showed higher Epworth Sleepiness Scale scores in summer compared with other seasons, while patients with idiopathic hypersomnia showed no changes in excessive daytime sleepiness across the four seasons. Epworth Sleepiness Scale scores were higher in idiopathic hypersomnia patients compared to narcolepsy type 1 and narcolepsy type 2 patients in spring, autumn, and winter; conversely, in summer there were no differences in Epworth Sleepiness Scale scores among the three groups. No significant differences in Epworth Sleepiness Scale scores were noted between patients with narcolepsy type 1 and narcolepsy type 2 throughout the year. Furthermore, no seasonal effect on cataplexy frequency was found in patients with narcolepsy type 1. This study demonstrates that seasonality may influence daytime sleepiness in patients with narcolepsy type 1 and narcolepsy type 2 but not in patients with idiopathic hypersomnia, while cataplexy symptoms remain unaffected by seasonal changes. The underlying mechanisms linking excessive daytime sleepiness to seasonality have yet to be explored, though social factors and vacation time may contribute to increased excessive daytime sleepiness in narcolepsy.

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Seasonal variation and sleep patterns in a hot climate Arab Region

Cited by 4 publications

References 30 publications

Association of elevated glycated hemoglobin and obesity with afternoon napping for more than 1 h in young and middle-aged healthy adults

Association of elevated glycated hemoglobin and obesity with afternoon napping for more than 1 h in young and middle-aged healthy adults

Individual sleep need is flexible and dynamically related to cognitive function

Variability of excessive daytime sleepiness and cataplexy according to seasonality: A study in central disorders of hypersomnolence

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