Light Therapy for PD - Dose Selection
Public ClinicalTrials.gov record NCT04291014. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.
Official title
A Dose Selection Trial of Light Therapy for Impaired Sleep in Parkinson's Disease
Brief summary
Reproduced verbatim from the official ClinicalTrials.gov record. Not medical advice.
This study aims to determine the most effective dose of light therapy to improve sleep in people with Parkinson's Disease. Four groups of participants will receive bright-white or dim-red light therapy at different times throughout the day.
Study identification
- NCT ID
- NCT04291014
- Recruitment status
- Completed
- Study type
- Interventional
- Phase
- Not applicable
- Enrollment
- 203 participants
Conditions and interventions
Conditions
Eligibility (public fields only)
- Age range
- 45 Years and older
- Sex
- All
- Healthy volunteers
- Healthy volunteers not accepted
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Sep 11, 2020 (Actual)
- Primary completion
- Nov 12, 2022 (Actual)
- Completion
- Jan 10, 2023 (Actual)
- Last update posted
- Mar 5, 2026
2020 – 2023
United States locations
- U.S. sites
- 25
- U.S. states
- 17
- U.S. cities
- 23
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| University of Alabama | Birmingham | Alabama | 35233 | — |
| Barrow Neurological Institute | Phoenix | Arizona | 85013 | — |
| UC Irvine | Irvine | California | 92697 | — |
| UC Davis | Sacramento | California | 95817 | — |
| Yale University | Fairfield | Connecticut | 06824 | — |
| University of Miami | Miami | Florida | 33136 | — |
| Northwestern University | Chicago | Illinois | 60611 | — |
| University of Iowa | Iowa City | Iowa | 52242 | — |
| Massachusetts General Hospital | Boston | Massachusetts | 02114 | — |
| Beth Israel Deaconess Medical Center | Boston | Massachusetts | 02215 | — |
| University of Michigan | Ann Arbor | Michigan | 48109 | — |
| Washington University in St. Louis | St Louis | Missouri | 63110 | — |
| Weill Cornell | New York | New York | 10021 | — |
| Mount Sinai - Icahn School of Medicine | New York | New York | 10029 | — |
| University of Rochester | Rochester | New York | 14642 | — |
| SUNY Stonybrook | Stony Brook | New York | 11794 | — |
| SUNY Upstate | Syracuse | New York | 13210 | — |
| Wake Forest University | Winston-Salem | North Carolina | 27104 | — |
| University of Cincinnati | Cincinnati | Ohio | 45219 | — |
| Ohio State University | Columbus | Ohio | 43221 | — |
| University of Pennsylvania | Philadelphia | Pennsylvania | 19107 | — |
| University of Pittsburgh | Pittsburgh | Pennsylvania | 15213 | — |
| Vanderbilt University | Nashville | Tennessee | 37232 | — |
| University of Utah | Salt Lake City | Utah | 84132 | — |
| University of Virginia | Charlottesville | Virginia | 22903 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT04291014, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted Mar 5, 2026 · Synced Oct 17, 2026
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Open the official record
The complete public registry record, listed eligibility criteria, and available contact information for NCT04291014 live on ClinicalTrials.gov.