Morning Bright Light Therapy and Daytime Functioning in University Students
Recruiting now · Not applicable
Conditions studied: Sleep, Circadian Rhythm, Daytime Sleepiness, Mood, Cognition, Healthy Volunteers
In brief
This study tests whether a week of morning bright light therapy changes how well healthy young adults sleep and how alert, positive, and mentally sharp they feel during the day. Morning light is the body's main signal for keeping its internal clock and sleep-wake timing on track. Many university students keep irregular hours and spend most of the day indoors, where light is far dimmer than daylight. This study asks whether adding a short, bright morning light session can help. Each participant takes part for two weeks. For one week they use a bright light box for 30 minutes each morning, shortly after waking; for the other week they keep their usual lighting. The order of the two weeks is decided at random, and each person serves as their own comparison. Throughout both weeks, sleep is tracked with a wrist-worn Fitbit and a short daily diary. Participants also rate their sleepiness and mood, complete brief computer-based attention and memory tasks, and take part in a short interview at the end about their experience. The study compares the bright-light week with the usual-light week to see whether morning bright light improves sleep regularity and efficiency, reduces daytime sleepiness, lifts mood, or affects thinking performance. The trial is being conducted in waves; a first wave has completed and a second wave is planned, pending additional funding.
Key facts
- Study ID
- NCT07685262
- Run by
- The Hong Kong Polytechnic University
- People needed
- 153
- Starts
- 2024-05-01
- Expected to finish
- 2028-06-30
- Last updated by the study team
- 2026-07-06
Who can join
Age: 18 and older. Sex: any. Healthy volunteers: accepted.
You may qualify if…
- Enrolled university student
- Aged 18 years or older
- Generally healthy, with no diagnosed sleep disorder (sleep quality screened using the Pittsburgh Sleep Quality Index)
- Residing in shared student housing
You may not qualify if…
- Diagnosed insomnia or other diagnosed sleep disorder
- Other medical, psychiatric, or neurological condition that could affect sleep, mood, or cognition
Where it is running
- The Hong Kong Polytechnic University — Hung Hom, Hong Kong (enrolling)
Full record on ClinicalTrials.gov
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