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

NCT ID NCT07465250

Completed Symptom relief Sponsor: Colorado State University Source: ClinicalTrials.gov ↗

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.

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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

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