Neu, Daniel, Cappeliez, Bernard, Hoffmann, Guy et al. · Journal of clinical neurophysiology : official publication of the American Electroencephalographic Society · 2009 · DOI
This study compared sleep patterns between people with ME/CFS and people with a primary sleep disorder (sleep apnea) to see if ME/CFS might actually be a sleep problem in disguise. Researchers found that ME/CFS patients have distinctly different sleep patterns—more deep sleep and fewer light sleep stages—compared to people with actual sleep disorders. This suggests ME/CFS is not primarily a sleep disorder, even though both conditions cause people to feel unrefreshed.
This study addresses a persistent misconception that ME/CFS is simply an undetected primary sleep disorder or anxiety disorder. By demonstrating fundamentally different sleep architecture patterns between ME/CFS and documented sleep disorders, it provides objective evidence supporting ME/CFS as a distinct condition, which may help improve recognition and reduce diagnostic dismissal.
This study does not establish the cause of the abnormal sleep patterns in ME/CFS, nor does it explain why increased slow-wave sleep occurs. The cross-sectional design prevents determination of whether sleep abnormalities are a cause or consequence of ME/CFS illness. The findings do not rule out other physiological mechanisms that might underlie both sleep changes and fatigue symptoms.
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, Cappeliez, Bernard, Hoffmann, Guy, Verbanck, Paul, Linkowski, Paul, & Le Bon, Olivier (2009). High slow-wave sleep and low-light sleep: chronic fatigue syndrome is not likely to be a primary sleep disorder.. Journal of clinical neurophysiology : official publication of the American Electroencephalographic Society. https://doi.org/10.1097/WNP.0b013e3181a1841b
BibTeX
@article{mecfsatlas-neu-2009-high-slow,
author = {Neu, Daniel and Cappeliez, Bernard and Hoffmann, Guy and Verbanck, Paul and Linkowski, Paul and Le Bon, Olivier},
title = {High slow-wave sleep and low-light sleep: chronic fatigue syndrome is not likely to be a primary sleep disorder.},
journal = {Journal of clinical neurophysiology : official publication of the American Electroencephalographic Society},
year = {2009},
doi = {10.1097/WNP.0b013e3181a1841b},
note = {PubMed: 19424087},
url = {https://www.mecfsatlas.com/evidence/neu-2009-high-slow},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-30. https://www.mecfsatlas.com/evidence/neu-2009-high-slow
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