Le Bon, O, Fischler, B, Hoffmann, G et al. · Sleep research online : SRO · 2000
This study looked at whether sleep problems might explain ME/CFS symptoms in 46 patients. Researchers found that many CFS patients did have sleep disorders like sleep apnea, but these sleep problems were not connected to how severe their CFS was or their other symptoms. Importantly, over half of the CFS patients had no sleep disorders at all, suggesting that ME/CFS is a distinct condition separate from typical sleep problems.
This study is important because it challenges the assumption that ME/CFS is merely a consequence of underlying sleep disorders, a common misconception among both clinicians and patients. By demonstrating that a majority of ME/CFS patients have neither sleep disorders nor objective sleepiness, it provides evidence that ME/CFS has distinct biological mechanisms deserving independent research attention. Understanding that ME/CFS and sleep disorders are separable helps refine diagnostic criteria and appropriate treatment strategies.
This study does not prove that sleep disorders never occur in ME/CFS or that they never contribute to symptom severity in individual patients. It also does not exclude the possibility that certain subsets of CFS patients have sleep-related pathophysiology, given the significant percentage with sleep apnea. The cross-sectional design cannot establish causality or temporal relationships between sleep architecture changes and CFS onset.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
The first block is for the primary paper and is the citation you should use in research work. The atlas-snapshot line only applies if you are specifically referring to this atlas’s reading of the paper on the date shown.
Primary citation
Le Bon, O, Fischler, B, Hoffmann, G, Murphy, J R, De Meirleir, K, Cluydts, R, et al. (2000). How significant are primary sleep disorders and sleepiness in the chronic fatigue syndrome?. Sleep research online : SRO. https://pubmed.ncbi.nlm.nih.gov/11382899/
BibTeX
@article{mecfsatlas-le-bon-2000-how-significant,
author = {Le Bon, O and Fischler, B and Hoffmann, G and Murphy, J R and De Meirleir, K and Cluydts, R and Pelc, I},
title = {How significant are primary sleep disorders and sleepiness in the chronic fatigue syndrome?},
journal = {Sleep research online : SRO},
year = {2000},
note = {PubMed: 11382899},
url = {https://www.mecfsatlas.com/evidence/le-bon-2000-how-significant},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-30. https://www.mecfsatlas.com/evidence/le-bon-2000-how-significant
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