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Teens' sleep and light habits under the microscope

NCT ID NCT04921215

Knowledge-focused Sponsor: Rush University Medical Center 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 26, 2026 · Last updated Jun 26, 2026

Summary

This study looked at how lack of sleep and evening light exposure affect the body clocks of teenagers aged 14 to 17. Researchers used morning bright light to try to shift teens' sleep schedules earlier. They measured changes in melatonin levels and sleep patterns to understand when the light stops working. The goal is to learn how to better help teens align their sleep with school schedules.

What this could mean

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

Active substance
morning bright light from light boxes
What this could lead to
If successful, this could help design better light-based treatments to improve sleep and reduce health risks in teenagers.
What could go wrong
This is a small, early-stage observational study, not a treatment trial. Results may not apply to all teens or real-world settings.

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

88 people

The number who actually took part.

Started

Jun 2021

Finished

Aug 2025

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

14 to 17 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: * 14-17 years old; * Participants and parents have sufficient knowledge of the English language; * Participants are fully vaccinated for COVID-19 Exclusion Criteria: * personal history of a psychotic disorder, bipolar disorder, neurological disorder, psychopathology, sleep disorder (sleep apnea, restless legs syndrome, narcolepsy, insomnia), metabolic disorders, chronic medical conditions (e.g., cancer, diabetes, kidney disease, active asthma), or infectious illness; * current illness, fever or symptoms of respiratory infection or allergy at the time of laboratory assessments; * current use of prescribed mediations (except birth control pills); * current use of melatonin or over-the-counter medications that can affect the sleep/wake cycle, daytime sleepiness, or suppress melatonin; * physical handicap that interferes with the study (e.g., blind); * mental retardation or other pervasive developmental disorder; * symptoms of depressed mood based on a score of 16 or greater on the Center for Epidemiological Studies fro Depression (CES-D); * suicidal ideation (past or current) * travel beyond two time zones within a month of beginning the study; * female participants who indicate symptoms of premenstrual dysphoric disorder (PMDD) * unusual sleep lengths (means \< 6 hours or \> 10 hours); * color blind as determined by the Ishihara color blindness test, or eye surgery to correct for lens curvature; * positive test for illicit drugs or nicotine; * positive test for alcohol at the beginning of the 7-day lab stay

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Conditions

The condition(s) this trial relates to.

circadian rhythm sleep disorder sleep disorder

As listed by the trial registrant

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

Adolescence Chronobiology Circadian rhythm LIGHT Sleep

Contacts and locations

Locations

  • Rush University Medical Center, Biological Rhythms Research Laboratory

    Chicago, Illinois, 60612, United States

More trials for these conditions

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