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Light's hidden power: could color and timing boost your brain?

NCT ID NCT05232383

Knowledge-focused Sponsor: University Hospital, Strasbourg, France Source: ClinicalTrials.gov ↗

What the study statuses mean

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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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Aug 20, 2026 · Last updated Aug 21, 2026 · Updated 1 time

Summary

This study investigates how different colors of artificial light—polychromatic, red, and green—and the time of day they are used affect sleep, alertness, thinking, and mood. Healthy adults aged 18 to 40 will be exposed to these lights for 2.5 hours at various times, with some sessions including sleep. The goal is to understand the benefits and risks of artificial light on daily brain function.

What this could mean

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

Active substance
polychromatic, red, and green light exposure at different times of day
What this could lead to
If this works, it could guide better lighting designs to improve alertness, sleep, and cognitive performance in everyday life.
What could go wrong
This is an early-stage observational study, so results may not apply broadly. Individual responses to light can vary, and the effects might be modest.

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

96 people

The number who actually took part.

Started

Dec 2021

Finished

Jul 2026

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 to 40 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

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: * Male or female * Aged 18 to 40 years * With a hint of Bodymass index (BMI) between 17 and 30 kg.m - 2 * healthy subject determined by a clinical examination, a psychological interview, a blood test, a urine analysis * Subject with a score\<6 questionnaire PSQI ("Sleep Questionnaire Pittsburgh") * Subject agreeing to maintain a regular sleep/wake rhythm during the study * Subject agreeing to refrain from caffeine, nicotine, alcohol, psychotropic drugs, cannabis or other drugs, during the study * Signed informed consent * Subjectaffiliated to a social protection scheme Exclusion Criteria: * somatic diseases: cardiovascular, respiratory, gastrointestinal, hematopoietic, Visual * immune system diseases * kidneys and urinary tract diseases * endocrine and metabolic diseases * neurological diseases * infectious diseases * thrombocytopenia or other malfunction of blood platelets * Subject with risk of thrombosis, including subject with a history of phlebitis, smoker under oral contraceptive... * Subject with an addiction to caffeine, nicotine, alcohol, psychotropic drugs, cannabis, or any other drug * Subject treatment contraindicated or inadvisable in combination with heparin * blood donation in the previous 3 months before the inclusion * Participation in other clinical trials * Work by shifts in the year preceding the inclusion * Trans-meridian travel (\> 2 time zones) in the month previous the inclusion * Impossibility to give enlightened information (subject in an emergency situation, understanding difficulties,...) * Subject under safeguard of justice * Subject under tutorship or curatorship * Pregnancy (women of childbearing age) * Breastfeeding * Diet incompatible with the study's snack choices

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As listed by the trial registrant

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

Human sleep and chronobiology

Contacts and locations

Locations

  • Hôpitaux Universitaires de Strasbourg

    Strasbourg, 67091, France

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