Whelton, C L, Salit, I, Moldofsky, H · The Journal of rheumatology · 1992
This study compared sleep patterns, virus exposure, and symptoms in 14 ME/CFS patients versus 12 healthy people. Patients reported sleep that didn't feel refreshing and had unusual brain wave patterns during sleep, but didn't show excessive daytime sleepiness. The study found no evidence that a chronic Epstein-Barr virus infection was causing the illness, but patients did have more widespread pain, tender points, and depression symptoms.
This study was foundational in establishing that ME/CFS involves distinct sleep physiology abnormalities (alpha-wave intrusion) rather than simply being a chronic viral infection or psychological disorder. Understanding these biological sleep disturbances has helped validate ME/CFS as a medical condition and opened research into whether abnormal sleep patterns contribute to or result from other symptoms.
This study does not prove that EBV never plays a role in ME/CFS development, only that chronic persistent infection wasn't present in these 14 patients. The cross-sectional design cannot establish whether sleep abnormalities cause pain and depression, or whether they are consequences of the illness. Small sample size limits generalizability.
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
Whelton, C L, Salit, I, & Moldofsky, H (1992). Sleep, Epstein-Barr virus infection, musculoskeletal pain, and depressive symptoms in chronic fatigue syndrome.. The Journal of rheumatology. https://pubmed.ncbi.nlm.nih.gov/1328633/
BibTeX
@article{mecfsatlas-whelton-1992-sleep-epstein,
author = {Whelton, C L and Salit, I and Moldofsky, H},
title = {Sleep, Epstein-Barr virus infection, musculoskeletal pain, and depressive symptoms in chronic fatigue syndrome.},
journal = {The Journal of rheumatology},
year = {1992},
note = {PubMed: 1328633},
url = {https://www.mecfsatlas.com/evidence/whelton-1992-sleep-epstein},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-30. https://www.mecfsatlas.com/evidence/whelton-1992-sleep-epstein
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