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Related Experiment Video

Updated: Apr 26, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Published on: August 8, 2019

Sleep duration and weight gain: reconsideration by panel data analysis.

Chihiro Nishiura¹, Hideki Hashimoto

¹Department of Safety and Health, Tokyo Gas Co., Ltd.

Journal of Epidemiology

|August 5, 2014

Summary

Shorter or longer sleep durations were initially linked to increased body mass index (BMI). However, after accounting for unobserved individual factors, this association between sleep duration and BMI changes disappeared, suggesting less impact on weight gain.

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Last Updated: Apr 26, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Published on: August 8, 2019

Human Circadian Phenotyping and Diurnal Performance Testing in the Real World

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Multidisciplinary Approach to Obesity Management: A Case Report

Multidisciplinary Approach to Obesity Management: A Case Report

Published on: May 30, 2025

Area of Science:

Occupational Health
Epidemiology
Sleep Science

Background:

Previous studies on sleep duration and body mass index (BMI) show inconsistent results.
Potential reasons include sleep duration misclassification and unmeasured confounders like genetics.

Purpose of the Study:

To investigate the longitudinal association between sleep duration and changes in BMI.
To address limitations of prior research by using repeated measurements and panel data analysis.

Main Methods:

Utilized panel data from mandatory health checkups of male non-shift workers (aged 19-39) in Japan from 2007 to 2010.
Employed secondary data analysis with annual follow-ups (n=1687, 6748 records).
Objectively measured BMI and self-reported sleep duration.

Main Results:

Initial analysis (population-averaged model) indicated significant BMI increases for 5-hour (0.11 kg/m²), 6-hour (0.07 kg/m²), and ≥8-hour (0.19 kg/m²) sleepers compared to 7-hour sleepers.
After adjusting for unobserved time-invariant confounders (fixed-effects model), these associations were significantly attenuated and became non-significant.

Conclusions:

The observed longitudinal association between sleep duration and BMI changes may be upwardly biased by unobserved, stable individual factors.
The actual net effect of sleep duration on weight gain might be less substantial than previously suggested by observational studies.