Neu, Daniel, Hoffmann, Guy, Moutrier, Robert et al. · Journal of sleep research · 2008 · DOI
This study asked whether ME/CFS patients experience daytime sleepiness (like wanting to nap) or mainly fatigue (exhaustion that doesn't improve with rest). Researchers tested 16 ME/CFS patients, 13 sleep apnea patients, and 12 healthy people using both objective sleep tests and questionnaires. They found that ME/CFS patients reported much higher fatigue than sleepiness, while sleep apnea patients showed the opposite pattern—suggesting fatigue and sleepiness are different problems.
This study challenges the assumption that ME/CFS fatigue is simply excessive daytime sleepiness, a distinction that matters for diagnosis and treatment. Understanding that ME/CFS involves a unique fatigue profile—rather than primary sleep pathology—helps validate patient experiences and guide clinicians toward appropriate management strategies.
This study does not prove that ME/CFS patients never experience sleepiness, nor does it identify the biological cause of fatigue in ME/CFS. The cross-sectional design and small, all-female sample limit generalizability, and the results reflect correlations rather than causal mechanisms underlying fatigue pathophysiology.
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
Neu, Daniel, Hoffmann, Guy, Moutrier, Robert, Verbanck, Paul, Linkowski, Paul, & Le Bon, Olivier (2008). Are patients with chronic fatigue syndrome just 'tired' or also 'sleepy'?. Journal of sleep research. https://doi.org/10.1111/j.1365-2869.2008.00679.x
BibTeX
@article{mecfsatlas-neu-2008-patients-chronic,
author = {Neu, Daniel and Hoffmann, Guy and Moutrier, Robert and Verbanck, Paul and Linkowski, Paul and Le Bon, Olivier},
title = {Are patients with chronic fatigue syndrome just 'tired' or also 'sleepy'?},
journal = {Journal of sleep research},
year = {2008},
doi = {10.1111/j.1365-2869.2008.00679.x},
note = {PubMed: 19021860},
url = {https://www.mecfsatlas.com/evidence/neu-2008-patients-chronic},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-28. https://www.mecfsatlas.com/evidence/neu-2008-patients-chronic
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