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Can bright light beat COVID fatigue? tiny trial hints at hope

NCT ID NCT05677932

Symptom relief Sponsor: Chinese University of Hong Kong Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 24, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This small study tested whether sitting under a bright light for 30 minutes a day for two weeks could help people with long-lasting fatigue after COVID-19. Twelve adults who had been tired for months after their infection took part. The goal was to see if the light therapy could reduce their tiredness, sleep problems, and low mood.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
bright light therapy (device)
What this could lead to
If it works, this could point toward a simple, non-drug way to reduce fatigue after COVID-19.
What could go wrong
This is a very small, early trial with only 12 participants. The results may not apply to everyone, and the effect may be small or due to chance.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

12 people

The number who actually took part.

Started

Feb 2023

Finished

Apr 2024

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Age 18 or above * Capable to give informed consent * COVID-19 infection confirmed by PCR test or a Rapid Antigen Test (RAT) with onset of at least three months * Reports new onset or exacerbation of fatigue after onset of COVID-19 and lasted for over two months * Scoring 7 or above for the item "worst level of fatigue during the last 24 hours" in the Brief Fatigue Inventory Exclusion Criteria: * A current or past history of bipolar disorder, schizophrenia, neurodevelopmental disorder, organic mental disorder; intellectual disabilities or substance use disorder. * Presence of contraindications to bright light therapy: for example, history of light induced migraine/ epilepsy; current use of photosensitizing medications; presence of eye disease: e.g. retinal blindness, severe cataract, glaucoma. * Significant medical condition/ hearing impairment/ speech deficit leading to incapability of completing clinical interview. * Regular shift-workers * Trans-meridian flight in the past 3 months and during the study * Currently receiving any structured psychotherapy * Self-reported untreated sleep disorders (e.g. severe insomnia, obstructive sleep apnea, restless leg syndrome), psychiatric illness (e.g. depression), or medical conditions associated with fatigue (e.g. anemia, heart failure, autoimmune disorders) * Enrolment in another clinical trial of an investigational medicinal product or device.

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Conditions

The condition(s) this trial relates to.

COVID-19 Fatigue long COVID-19 post-COVID-19 disorder

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Post-COVID-19 condition

Contacts and locations

Locations

  • The Chinese University of Hong Kong

    Hong Kong, Hong Kong

More trials for these conditions

Other studies related to the condition(s) this trial covers.