Journal of translational medicineJul 3, 2026

Light exposure patterns linked to various health outcomes in people with chronic fatigue syndrome

Circadian Biology Weekly Brief ↗PubMed ↗DOI ↗OA ↗

Updated Jul 4, 2026

Abstract

Light exposure may significantly influence the severity of Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS).

Circadian rhythms and sleep-wake cycles are regulated by light, impacting overall well-being.
Patients with ME/CFS frequently report circadian disruption and poor sleep quality.
The connection between light exposure levels and the severity of ME/CFS symptoms is still not well understood.

Simplified

Light is a major environmental factor regulating circadian rhythms, sleep- wake cycles, and mood-related behaviors. Patients with Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) often experience circadian disruption and poor sleep quality, which severely compromise their quality of life; however, the relationship between light exposure and illness severity remains largely unknown.

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Competing interests

Declarations. Ethical approval and consent to participate: This study protocol has been revised and approved by the local Ethics Committee of Vall d’Hebron University Hospital, Barcelona, Spain (approval code: PR/AG-201/2016 on 19 September 2019). Written informed consent for the publication of anonymized data was obtained from all the participants. Meanwhile, the ethical principles for medical research involving human participants as stipulated in the 2024 Declaration of Helsinki have been complied with. Competing interests: The authors declare that they have no conflict of interest.

PubMed

Light exposure patterns linked to various health outcomes in people with chronic fatigue syndrome

Abstract

Full Text

Funding

Competing interests

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