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Light exposure may sharpen your mind and improve sleep

NCT ID NCT02858765

Knowledge-focused Sponsor: University Hospital, Strasbourg, France 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 study looked at how different times of light exposure affect sleep, brain waves, and thinking skills in 92 healthy adults aged 18 to 40. Participants were exposed to white light for 2.5 hours at various times of day. The goal was to understand light's influence on sleep quality and mental tasks, and to test new ways of recording brain activity over long periods.

What this could mean

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

Active substance
white polychromatic light
What this could lead to
If successful, this could help design better lighting to improve sleep and mental performance.
What could go wrong
This is a small, early-stage study in healthy volunteers, so results may not apply to people with sleep disorders or other conditions.

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

92 people

The number who actually took part.

Started

Jun 2016

Finished

Jun 2019

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 and an ophthalmologic examination * Topic 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 * Subject affiliated 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 * Allergy to neoprene or lycra * Dysfunction of the temporomandibular joint (TMJD) * Blood donation in the previous 3 months before the inclusion * Participation in other clinical trials in the previous 3 months before the inclusion * Work by shifts in the year preceding the inclusion * Trans-meridian travel (\> 2 time zones) in the month previous the inclusion * Contraindications to the use of the medical device * 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

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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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