Russell, Charlotte, Wearden, Alison J, Fairclough, Gillian et al. · Sleep · 2016 · DOI
This study found that how people with ME/CFS feel about their sleep quality matters more for next-day fatigue than what sleep monitors actually measure. When patients reported poor sleep quality or felt their sleep wasn't refreshing, they experienced worse fatigue the following day. Interestingly, people who worried or felt anxious before bed reported worse sleep, and waking up in a bad mood partly explained why poor sleep led to more fatigue.
This study highlights that in ME/CFS, the experience of sleep quality may be more clinically relevant to fatigue than objective sleep duration—a finding that could reshape how sleep problems are assessed and treated. Understanding that presleep worry and morning mood influence this relationship suggests targets for behavioral interventions that might improve fatigue without necessarily increasing total sleep time.
This study does not prove that poor sleep quality causes fatigue or that improving sleep perceptions will definitely reduce fatigue—it only shows they are associated. The small sample size (n=27) and short duration (6 days) limit generalizability. The study cannot explain why actigraphy and subjective sleep diverge so markedly in ME/CFS, nor does it establish whether the relationship is bidirectional (fatigue affecting sleep perception).
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
Russell, Charlotte, Wearden, Alison J, Fairclough, Gillian, Emsley, Richard A, & Kyle, Simon D (2016). Subjective but Not Actigraphy-Defined Sleep Predicts Next-Day Fatigue in Chronic Fatigue Syndrome: A Prospective Daily Diary Study.. Sleep. https://doi.org/10.5665/sleep.5658
BibTeX
@article{mecfsatlas-russell-2016-subjective-but,
author = {Russell, Charlotte and Wearden, Alison J and Fairclough, Gillian and Emsley, Richard A and Kyle, Simon D},
title = {Subjective but Not Actigraphy-Defined Sleep Predicts Next-Day Fatigue in Chronic Fatigue Syndrome: A Prospective Daily Diary Study.},
journal = {Sleep},
year = {2016},
doi = {10.5665/sleep.5658},
note = {PubMed: 26715232},
url = {https://www.mecfsatlas.com/evidence/russell-2016-subjective-but},
}Atlas snapshot reference
ME/CFS Atlas. Generator v1 / Scanner v1.4 / policy v0.1. Accessed 2026-05-28. https://www.mecfsatlas.com/evidence/russell-2016-subjective-but
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