Afternoon light may be key to fixing Teens' sleep
NCT ID NCT04753190
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study tested whether bright light in the afternoon, alone or with morning light, can shift teens' internal body clocks earlier. 84 adolescents aged 18-20 followed a stable sleep schedule and then lived in a lab for a week. Researchers measured melatonin levels to track clock changes. The goal is to find better ways to reduce sleep problems and related health risks in teens.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
- Active substance
- bright light exposure
- What this could lead to
- If successful, this could lead to better timing of light therapy to help teens sleep earlier and improve daytime functioning.
- What could go wrong
- This is a small, early mechanistic study, not a treatment trial. Results may not apply to all teens or lead to practical interventions.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
-
Rush University Medical Center
Chicago, Illinois, 60612, United States
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