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Morning blue, evening red: a simple light trick for better sleep?

NCT ID NCT07465250

Symptom relief Sponsor: Colorado State University 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 tested whether a combination of morning blue light and evening red light therapy could improve sleep in 20 adults with mild sleep complaints. Participants wore a wrist device to track sleep during a normal week and then during a week of light therapy. The goal was to see if this light routine helps people fall asleep faster and feel more awake in the morning.

What this could mean

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

Active substance
light therapy (morning blue light and evening red light)
What this could lead to
If it works, this could offer a simple, drug-free way to help people with mild sleep problems fall asleep faster and feel more alert during the day.
What could go wrong
This is a very small, early study with only 20 people, so results may not apply to everyone. It also only looks at short-term effects, not long-term sleep improvement.

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

20 people

The number who actually took part.

Started

Jul 2024

Finished

Jul 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

18 years and older

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: * Adults age 18 and older * Subclinical complaints of disrupted sleep or poor sleep quality * a score of 3 or greater on the Pittsburgh Sleep Quality Index (PSQI) Exclusion Criteria: * Younger than 18 years of age, * Complaints of disrupted or poor sleep with a PSQI score of less than 2 * Previously diagnosed clinical sleep disorder, such as insomnia or Circadian Rhythm Sleep Disorder (CRSD) * Employment in evening, night, or rotating shifts * Engagement in irregular sleep patterns that are not aligned with the biological night * Inability to comply with the study protocol and at-home study requirements

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Conditions

The condition(s) this trial relates to.

insomnia sleep disorder

As listed by the trial registrant

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

Sleep

Contacts and locations

Locations

  • Colorado State University

    Fort Collins, Colorado, 80523, United States

More trials for these conditions

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