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ClinicalTrials.gov public records Last synced Oct 1, 2026, 1:20 PM EDT

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Showing 25–48 of 258 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Circadian Rhythm Clear all
Active, not recruiting Not applicable Interventional

Bright Light Therapy for Non-motor Symptoms in Parkinson's Disease

NCT02909192
View directory record Official record
Conditions
Parkinson's Disease
Interventions
Light Therapy Device
Device
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
40 Years and older
Enrollment
65 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2026
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Nov 5, 2025 · Synced Oct 1, 2026, 1:20 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Circadian Rhythm Disruption Effects on Smoke Inhalation

NCT04955431
View directory record Official record
Conditions
Inflammation, Sleep Deprivation, Circadian Rhythm Sleep Disorder, Shift Work Type, Smoke Inhalation
Interventions
Sleep Restriction, Normal Sleep
Behavioral
Lead sponsor
University of Montana
Other
Eligibility
18 Years to 44 Years · Male only
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022
U.S. locations
1
States / cities
Missoula, Montana
Source: ClinicalTrials.gov public record
Updated May 30, 2025 · Synced Oct 1, 2026, 1:20 PM EDT
Completed Phase 3 Interventional Results available

The Clinical Utility of Measuring the Circadian Clock in Treatment of Delayed Sleep-Wake Phase Disorder

NCT03715465
View directory record Official record
Conditions
Delayed Sleep Phase Syndrome
Interventions
Melatonin 0.5 MG, Dim Light Melatonin Onset (salivary)
Drug · Other
Lead sponsor
University of Michigan
Other
Eligibility
18 Years to 65 Years
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2021
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Nov 25, 2022 · Synced Oct 1, 2026, 1:20 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Countermeasures to Circadian Misalignment

NCT04966351
View directory record Official record
Conditions
Circadian Rhythm Sleep Disorder of Shift Work Type, Metabolic Disease, Insulin Sensitivity
Interventions
Time-restricted feeding, Circadian Misalignment
Behavioral
Lead sponsor
Colorado State University
Other
Eligibility
18 Years to 35 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2026
U.S. locations
1
States / cities
Fort Collins, Colorado
Source: ClinicalTrials.gov public record
Updated Jul 24, 2025 · Synced Oct 1, 2026, 1:20 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

NIMH Rhythms and Blues Study: A Prospective Natural History Study of Motor Activity, Mood States, and Bipolar Disorder

NCT05669703
View directory record Official record
Conditions
Bipolar Disorder, Major Depression, Migraine
Interventions
Not listed
Lead sponsor
National Institute of Mental Health (NIMH)
NIH
Eligibility
8 Years to 70 Years
Enrollment
1,260 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2027
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 13, 2026 · Synced Oct 1, 2026, 1:20 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Circadian Rhythms and Cardiovascular Risk

NCT02202811
View directory record Official record
Conditions
Obstructive Sleep Apnea
Interventions
Forced Desynchrony
Behavioral
Lead sponsor
Oregon Health and Science University
Other
Eligibility
40 Years to 80 Years
Enrollment
39 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2020
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Jul 2, 2025 · Synced Oct 1, 2026, 1:20 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Bright Light Treatment On Elders In a Long Term Care Environment

NCT01042587
View directory record Official record
Conditions
Behavioral Responses to Bright Light Therapy in Elders
Interventions
exposure to bright light, low luminosity red light
Other
Lead sponsor
Milton S. Hershey Medical Center
Other
Eligibility
65 Years and older
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2010
U.S. locations
1
States / cities
Elizabethtown, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Aug 11, 2010 · Synced Oct 1, 2026, 1:20 PM EDT
Completed Phase 4 Interventional Accepts healthy volunteers

Efficacy of Ramelteon on Insomnia Symptoms Associated With Jet Lag in Healthy Adult Volunteers

NCT00492011
View directory record Official record
Conditions
Circadian Dysregulation
Interventions
Ramelteon, Placebo
Drug
Lead sponsor
Takeda
Industry
Eligibility
18 Years to 50 Years
Enrollment
110 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007
U.S. locations
4
States / cities
Miami, Florida • Pembroke Pines, Florida • Honolulu, Hawaii + 1 more
Source: ClinicalTrials.gov public record
Updated Feb 28, 2012 · Synced Oct 1, 2026, 1:20 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Effects of Melatonin on Insomnia Symptoms in Older Adults

NCT00230737
View directory record Official record
Conditions
Sleep Initiation and Maintenance Disorders
Interventions
Melatonin 0.4 mg, Melatonin 4.0 mg, Placebo
Drug
Lead sponsor
Nalaka Gooneratne
Other
Eligibility
65 Years and older
Enrollment
27 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2008
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Mar 8, 2017 · Synced Oct 1, 2026, 1:20 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Circadian Rhythm of Melatonin in Burns

NCT01596101
View directory record Official record
Conditions
Sleep, Burns
Interventions
Not listed
Lead sponsor
Shriners Hospitals for Children
Other
Eligibility
5 Years to 18 Years
Enrollment
86 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2014
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Aug 12, 2014 · Synced Oct 1, 2026, 1:20 PM EDT
Terminated No phase listed Observational Accepts healthy volunteers

Biomarkers for Circadian Timing in Healthy Adults

NCT03956745
View directory record Official record
Conditions
Sleep Wake Disorders, Sleep Disorders, Circadian Rhythm, Sleep Disorders, Intrinsic, Advanced Sleep Phase Syndrome (ASPS), Advanced Sleep Phase Syndrome, Advanced Sleep Phase, Delayed Sleep Phase, Delayed Sleep Phase Syndrome, Non-24 Hour Sleep-Wake Disorder, Irregular Sleep-Wake Syndrome, Shift-Work Sleep Disorder, Shift Work Type Circadian Rhythm Sleep Disorder, Delayed Phase Sleep Syndrome
Interventions
sleep-wake timing, constant routine
Behavioral
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years to 70 Years
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2025
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 3, 2025 · Synced Oct 1, 2026, 1:20 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Impact of Yo-Yo Sleep on Cardiometabolic Health

NCT05880758
View directory record Official record
Conditions
Cardiometabolic Syndrome, Obesity
Interventions
Intermittent Short Sleep (ISS), Social Jetlag (SJL), Sustained Adequate Sleep (SAS)
Behavioral
Lead sponsor
Columbia University
Other
Eligibility
18 Years to 49 Years
Enrollment
72 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2028
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 18, 2026 · Synced Oct 1, 2026, 1:20 PM EDT
Completed Not applicable Interventional

Effect of Therapeutic Light on Sleep, Circadian Rhythm, and Global Function in Women With Alzheimer's

NCT02502045
View directory record Official record
Conditions
Alzheimer's Disease
Interventions
Morning Simulated Sunlight, Non-therapeutic Red Light
Device
Lead sponsor
Yale University
Other
Eligibility
65 Years and older · Female only
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
1
States / cities
Farmington Hills, Michigan
Source: ClinicalTrials.gov public record
Updated Feb 20, 2017 · Synced Oct 1, 2026, 1:20 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers

Clinical Trial of Propranolol for Seasonal Affective Disorder

NCT00016666
View directory record Official record
Conditions
Seasonal Affective Disorder, Healthy
Interventions
Propranolol
Drug
Lead sponsor
National Institute of Mental Health (NIMH)
NIH
Eligibility
18 Years to 50 Years
Enrollment
70 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2001 – 2007
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 2, 2017 · Synced Oct 1, 2026, 1:20 PM EDT
Terminated Not applicable Interventional Results available

Young Blind Child Melatonin Treatment Study

NCT00688935
View directory record Official record
Conditions
Blindness
Interventions
Melatonin
Biological
Lead sponsor
Oregon Health and Science University
Other
Eligibility
1 Year to 20 Years
Enrollment
9 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2015
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Nov 27, 2019 · Synced Oct 1, 2026, 1:20 PM EDT
Not yet recruiting Not applicable Interventional Accepts healthy volunteers

Does Fatigue Coaching Improve Functioning and Fatigue in Resident Night Shifts

NCT06100809
View directory record Official record
Conditions
Fatigue, Shift Work Type Circadian Rhythm Sleep Disorder
Interventions
Personalized coaching, Nutrition handout
Behavioral
Lead sponsor
University of Massachusetts, Worcester
Other
Eligibility
Not listed
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2027
U.S. locations
1
States / cities
Worcester, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 13, 2026 · Synced Oct 1, 2026, 1:20 PM EDT
Withdrawn No phase listed Observational

Post Discharge Circadian Rhythms Post Adenotonsillectomy

NCT03217708
View directory record Official record
Conditions
Circadian Dysrhythmia
Interventions
Jawbone UP4
Device
Lead sponsor
Baylor College of Medicine
Other
Eligibility
5 Years to 10 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2022
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Mar 31, 2022 · Synced Oct 1, 2026, 1:20 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Meal Schedule Effects on Circadian Energy Balance in Adults

NCT04144426
View directory record Official record
Conditions
Metabolism, Circadian Rhythms
Interventions
Normal diet, Modified diet
Behavioral
Lead sponsor
Vanderbilt University
Other
Eligibility
50 Years and older
Enrollment
6 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2017
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Oct 30, 2019 · Synced Oct 1, 2026, 1:20 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Human Circadian Sensitivity to Very Short Light Pulses

NCT01330992
View directory record Official record
Conditions
Circadian Rhythm Disorders
Interventions
Ocular light or darkness exposure
Other
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years to 30 Years
Enrollment
400 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2011
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 23, 2011 · Synced Oct 1, 2026, 1:20 PM EDT
Active, not recruiting Phase 3 Interventional

Evaluating the Effects of Tasimelteon vs. Placebo in Delayed Sleep-Wake Phase Disorder (DSWPD)

NCT04652882
View directory record Official record
Conditions
Sleep Wake Disorders, Sleep Disorders, Circadian Rhythm, Chronobiology Disorders
Interventions
Tasimelteon, Placebo
Drug
Lead sponsor
Vanda Pharmaceuticals
Industry
Eligibility
18 Years to 75 Years
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2026
U.S. locations
11
States / cities
Los Angeles, California • Redwood City, California • Aurora, Colorado + 8 more
Source: ClinicalTrials.gov public record
Updated Jul 27, 2026 · Synced Oct 1, 2026, 1:20 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Identification of Novel Circadian Biomarkers

NCT02291003
View directory record Official record
Conditions
Circadian Rhythm Disorders
Interventions
Not listed
Lead sponsor
Northwestern University
Other
Eligibility
18 Years to 60 Years
Enrollment
3 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2017
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Aug 31, 2018 · Synced Oct 1, 2026, 1:20 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Effect of Skipping Breakfast on Metabolic Function

NCT02093572
View directory record Official record
Conditions
Skipping Breakfast, Circadian Rhythms
Interventions
3 standard meals/day, 2 meals/day (omit breakfast)
Other
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years to 55 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2014 – 2017
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Mar 26, 2021 · Synced Oct 1, 2026, 1:20 PM EDT
Completed Not applicable Interventional Results available

The Influence of Time-Restricted Eating in Patients With Metabolic Syndrome

NCT04057339
View directory record Official record
Conditions
Metabolic Syndrome, Pre-Diabetes
Interventions
Time Restricted Eating + Standard of Care, Standard of Care
Behavioral
Lead sponsor
University of California, San Diego
Other
Eligibility
18 Years to 75 Years
Enrollment
122 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2024
U.S. locations
1
States / cities
La Jolla, California
Source: ClinicalTrials.gov public record
Updated Jul 30, 2026 · Synced Oct 1, 2026, 1:20 PM EDT
Recruiting Not applicable Interventional

Pupillometry in Delayed Sleep Wake Phase Disorder

NCT06949644
View directory record Official record
Conditions
Delayed Sleep-Wake Phase Disorder
Interventions
Light and Citalopram
Combination Product
Lead sponsor
Northwestern University
Other
Eligibility
16 Years and older
Enrollment
220 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2029
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jun 8, 2026 · Synced Oct 1, 2026, 1:20 PM EDT