AUTHOR=Darroudi Susan , Sharifan Payam , Sadeghzadeh Parastoo , Namjou Negin , Zamiri Bidary Mohammad , Zamani Parvin , Esmaily Habibollah , Ferns Gordon A. , Moohebati Mohsen , Ghayour-Mobarhan Majid 

TITLE=Overweight and Obesity are Potential Risk Factors for Disrupted Nocturnal Sleep in Iranian Adults: A Cross-Sectional Study

JOURNAL=International Journal of Public Health

VOLUME=Volume 66 - 2021

YEAR=2021

URL=https://www.ssph-journal.org/journals/international-journal-of-public-health/articles/10.3389/ijph.2021.633183

DOI=10.3389/ijph.2021.633183

ISSN=1661-8564

ABSTRACT=Statements of the problem: Obesity is a risk factor for several chronic conditions, including sleep disorders. Reduced nocturnal sleep is becoming an eminent public health problem, because of its impact on physical and mental well-being. We aimed to analyze the relationship between BMI, body fat percentage (FAT%), hip and waist circumference, and weight on the duration of nocturnal sleep.
Methods: This study was part of the MASHAD (Mashhad Stroke And Heart Atherosclerotic Disorders) cohort study. In all participants, height, weight, waist circumference and hip circumference, and BMI and FAT% were measured. BMI was used to categorize individuals into obese, overweight, and normal subjects. FAT% was used to categorize individuals into tertile: tertile 1 (low)<27.5, tertile 2 (medium) 27.5-41 and tertile 3 (high)>41. The level of nightly sleep duration was categorized into three groups: <6, 6-8 (reference group), and >8 hours.
Results: Of the 9360 participants in this study, 36.6% had a short nightly sleep (<6h), 53.4% had normal nightly sleep (6-8h) and 10% had long nightly sleep (>8h). There was an inverse association between FAT% and duration of sleep (P<0.05). Also, there was a significant inverse association between body weight and duration of sleep (P<0.05). Obese and overweight participants had 1.152 OR (CI:1.083-1.225) and 1.126 OR (CI:1.063-1.194) for a short duration of nocturnal sleep, respectively, relative to those with a normal BMI. 
Conclusions: BMI was an independent determinant of nocturnal sleep duration; obesity and overweight may have negative consequences on sleep duration. Weight control should be considered as a factor in adjusting sleep quality.