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ClinicalTrials.gov public records Last synced Sep 13, 2026, 9:31 PM EDT

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Showing 1–24 of 362 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Circadian Clear all
Not yet recruiting Not applicable Interventional Accepts healthy volunteers

Relationships Among Pupil Responses to Light, Circadian Rhythms, and Sleep

NCT07753889
View directory record Official record
Conditions
Circadian Rhythm, Pupillometry, Sleep
Interventions
Ocular light exposure from portable light box
Other
Lead sponsor
Elizabeth B Klerman MD PhD
Other
Eligibility
18 Years to 85 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2027 – 2035
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Sep 7, 2026 · Synced Sep 13, 2026, 9:31 PM EDT
Not listed Phase 1Phase 2 Interventional

Circadian Thermal Sensing to Detect Breast Disease

NCT02511301
View directory record Official record
Conditions
Early-Stage Breast Carcinoma
Interventions
Cyrcadia CBR™ device placement for abnormality screening
Device
Lead sponsor
Cyrcadia Health
Industry
Eligibility
21 Years and older · Female only
Enrollment
173 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2020
U.S. locations
2
States / cities
Mountain View, California • Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Jan 2, 2019 · Synced Sep 13, 2026, 9:31 PM EDT
Recruiting Not applicable Interventional

Effects of Blocking Blue Light at Night Post CABG, AVR, MVR, CABG AVR, CABG MVR, or SAH

NCT04578249
View directory record Official record
Conditions
Circadian Rhythm Disorders
Interventions
Blue light-blocking goggles, Clear goggles
Other
Lead sponsor
West Virginia University
Other
Eligibility
45 Years to 75 Years
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2027
U.S. locations
1
States / cities
Morgantown, West Virginia
Source: ClinicalTrials.gov public record
Updated Apr 19, 2026 · Synced Sep 13, 2026, 9:31 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Pathophysiology of Circadian Rhythm Delayed Sleep Wake Phase Disorder

NCT06471374
View directory record Official record
Conditions
Delayed Sleep Phase Syndrome, Delayed Sleep Phase
Interventions
Circadian rhythm assessment, Light sensitivity assessment
Behavioral
Lead sponsor
University of Colorado, Boulder
Other
Eligibility
16 Years to 40 Years
Enrollment
66 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2028
U.S. locations
2
States / cities
Boulder, Colorado • Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jun 16, 2026 · Synced Sep 13, 2026, 9:31 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 11, 2014 · Synced Sep 13, 2026, 9:31 PM EDT
Completed No phase listed Observational Accepts healthy volunteers Results available

Sleep Timing and Insulin Resistance in Adolescents With Obesity

NCT02585830
View directory record Official record
Conditions
Obesity
Interventions
Not listed
Lead sponsor
University of Colorado, Denver
Other
Eligibility
15 Years to 19 Years
Enrollment
25 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2015 – 2017
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Feb 18, 2020 · Synced Sep 13, 2026, 9:31 PM EDT
Completed Phase 1 Interventional

Sleep Enhancement Training Study for Experienced Shiftworkers

NCT00786357
View directory record Official record
Conditions
Shift-Work Sleep Disorder
Interventions
NIOSH shiftwork booklet, Sleep Enhancement Training System
Behavioral
Lead sponsor
University of California, San Francisco
Other
Eligibility
40 Years and older
Enrollment
32 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2010
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Jun 22, 2010 · Synced Sep 13, 2026, 9:31 PM EDT
Completed Not applicable Interventional Results available

Impact of Exenatide on Sleep in Type 2 Diabetes

NCT01136798
View directory record Official record
Conditions
Type 2 Diabetes, Sleep Disordered Breathing
Interventions
Exenatide, Placebo
Drug
Lead sponsor
University of Chicago
Other
Eligibility
18 Years and older
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2016
U.S. locations
2
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Sep 11, 2018 · Synced Sep 13, 2026, 9:31 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Timing of Sodium Intake and Nocturnal Sodium Excretion and Blood Pressure in Obese African Americans

NCT04021355
View directory record Official record
Conditions
Obesity, Hypertension, Circadian Dysregulation, Salt; Excess
Interventions
Oral sodium supplementation
Other
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
25 Years to 45 Years
Enrollment
61 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2025
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Aug 19, 2026 · Synced Sep 13, 2026, 9:31 PM EDT
Recruiting Phase 4 Interventional

Light Flashes to Treat Delayed Sleep Phase Disorder (DSPD)

NCT01406691
View directory record Official record
Conditions
Delayed Sleep Phase Disorder
Interventions
Flashes
Device
Lead sponsor
Stanford University
Other
Eligibility
15 Years to 19 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2028
U.S. locations
1
States / cities
Palo Alto, California
Source: ClinicalTrials.gov public record
Updated Mar 23, 2023 · Synced Sep 13, 2026, 9:31 PM EDT
Not listed No phase listed Observational

Observational Study to Investigate the Melatonin and Cortisol Circadian Rhythms of Individuals With Smith-Magenis Syndrome (SMS)

NCT02180451
View directory record Official record
Conditions
Smith Magenis Syndrome
Interventions
Not listed
Lead sponsor
Vanda Pharmaceuticals
Industry
Eligibility
6 Years to 50 Years
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 24, 2016 · Synced Sep 13, 2026, 9:31 PM EDT
Completed Not applicable Interventional

Systematic Light Exposure for Fatigue in Breast Cancer Patients

NCT03217201
View directory record Official record
Conditions
Cancer-related Problem/Condition, Fatigue, Circadian Rhythm Disorders
Interventions
Light Glasses (Experimental), Light Glasses (Comparison)
Device
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
18 Years and older · Female only
Enrollment
194 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2022
U.S. locations
3
States / cities
Duarte, California • New York, New York
Source: ClinicalTrials.gov public record
Updated Aug 22, 2023 · Synced Sep 13, 2026, 9:31 PM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Safety and Efficacy of VEC-162 on Circadian Rhythm in Healthy Adult Volunteers

NCT00490945
View directory record Official record
Conditions
Circadian Rhythm Sleep Disorders
Interventions
VEC-162
Drug
Lead sponsor
Vanda Pharmaceuticals
Industry
Eligibility
18 Years to 50 Years
Enrollment
45 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2004 – 2005
U.S. locations
2
States / cities
Boston, Massachusetts • Detroit, Michigan
Source: ClinicalTrials.gov public record
Updated Aug 25, 2014 · Synced Sep 13, 2026, 9:31 PM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Eating Behaviors in Shift Workers

NCT04468672
View directory record Official record
Conditions
Shift Work Type Circadian Rhythm Sleep Disorder, Eating Behavior
Interventions
Portion size
Behavioral
Lead sponsor
Columbia University
Other
Eligibility
20 Years to 55 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2027
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Feb 24, 2026 · Synced Sep 13, 2026, 9:31 PM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Facilitating Adjustment to Simulated Jet Lag

NCT05382923
View directory record Official record
Conditions
Circadian Rhythm Sleep Disorder, Jet Lag Type
Interventions
Bright Light, Bright Light + Exercise + Melatonin, Control
Behavioral
Lead sponsor
University of Arizona
Other
Eligibility
18 Years to 45 Years
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2023
U.S. locations
1
States / cities
Tucson, Arizona
Source: ClinicalTrials.gov public record
Updated May 18, 2022 · Synced Sep 13, 2026, 9:31 PM EDT
Completed Not applicable Interventional Results available

A Transdiagnostic Sleep and Circadian Treatment to Improve Community SMI Outcomes

NCT02469233
View directory record Official record
Conditions
Mental Disorders
Interventions
Transdiagnostic Intervention for Sleep and Circadian Dysfunction
Behavioral
Lead sponsor
University of California, Berkeley
Other
Eligibility
18 Years and older
Enrollment
121 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2019
U.S. locations
1
States / cities
Oakland, California
Source: ClinicalTrials.gov public record
Updated Aug 11, 2025 · Synced Sep 13, 2026, 9:31 PM EDT
Completed Phase 2 Interventional Results available

Efficacy of Ramelteon on Speeding Up Sleep in Subjects With Delayed Sleep Phase Syndrome

NCT00593736
View directory record Official record
Conditions
Sleep Disorders, Circadian Rhythm
Interventions
Ramelteon, Placebo
Drug
Lead sponsor
Takeda
Industry
Eligibility
18 Years and older
Enrollment
132 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2008
U.S. locations
42
States / cities
Birmingham, Alabama • Tucson, Arizona • Hot Springs, Arkansas + 39 more
Source: ClinicalTrials.gov public record
Updated Feb 27, 2012 · Synced Sep 13, 2026, 9:31 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Strengthening Circadian Signals

NCT03490864
View directory record Official record
Conditions
Improving Cardiometabolic Outcomes in Adults
Interventions
Melatonin 1 mg, Placebos, Meal Timing, NON Meal Timing
Dietary Supplement · Other
Lead sponsor
Northwestern University
Other
Eligibility
35 Years to 54 Years
Enrollment
43 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2024
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated May 22, 2025 · Synced Sep 13, 2026, 9:31 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Tech4Rest Trial With Team Truck Drivers

NCT03108599
View directory record Official record
Conditions
Sleep, Sleep Disturbance, Sleep Disorder, Shift Work, Health Knowledge, Attitudes, Practice, Health Behavior, Fatigue, Vibration; Exposure
Interventions
Enhanced Cab, Fit4Sleep
Other · Behavioral
Lead sponsor
Oregon Health and Science University
Other
Eligibility
21 Years and older
Enrollment
49 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2021
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Jul 24, 2024 · Synced Sep 13, 2026, 9:31 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Food and Circadian Timing

NCT04743271
View directory record Official record
Conditions
Diet, High-Fat, Circadian Rhythm
Interventions
High-Fat Diet, Low-Fat Diet
Other
Lead sponsor
Oregon Health and Science University
Other
Eligibility
18 Years to 40 Years
Enrollment
14 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2026
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Nov 9, 2025 · Synced Sep 13, 2026, 9:31 PM EDT
Completed Phase 2Phase 3 Interventional

Evaluating the Effects of Tasimelteon vs Placebo on Sleep Disturbances in SMS

NCT02231008
View directory record Official record
Conditions
Smith-Magenis Syndrome, Circadian
Interventions
tasimelteon, placebo
Drug
Lead sponsor
Vanda Pharmaceuticals
Industry
Eligibility
3 Years to 65 Years
Enrollment
49 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2022
U.S. locations
4
States / cities
Santa Monica, California • Baltimore, Maryland • Chevy Chase, Maryland + 1 more
Source: ClinicalTrials.gov public record
Updated Nov 17, 2022 · Synced Sep 13, 2026, 9:31 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Sleep, Circadian Hormonal Dysregulation, and Breast Cancer Survival

NCT00519168
View directory record Official record
Conditions
Breast Cancer
Interventions
Urine sample, Electrode sleep recorder, phlebotomy
Procedure · Device
Lead sponsor
Stanford University
Other
Eligibility
45 Years to 75 Years · Female only
Enrollment
141 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2011
U.S. locations
1
States / cities
Stanford, California
Source: ClinicalTrials.gov public record
Updated Oct 5, 2017 · Synced Sep 13, 2026, 9:31 PM EDT
Recruiting Not applicable Interventional

Reestablishing Sleep and Circadian Alignment in Medical Intensive Care Unit (MICU) Patients Via a Mechanistic RCT of an Sleep Chronobundle

NCT05551325
View directory record Official record
Conditions
Critical Illness, Sleep Deprivation, Circadian Rhythm Sleep Disorder, Unspecified
Interventions
Chronobundle - light, chronobundle - feeding, chronobundle - mobility, chronobundle - sleep
Other
Lead sponsor
Yale University
Other
Eligibility
18 Years and older
Enrollment
160 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2029
U.S. locations
2
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated May 19, 2026 · Synced Sep 13, 2026, 9:31 PM EDT
Not yet recruiting Not applicable Interventional

Aerobic Exercise as a Countermeasure for Night Shift Associated Circadian Misalignment

NCT07668622
View directory record Official record
Conditions
Healthy, Circadian Misalignment
Interventions
Exercise
Behavioral
Lead sponsor
University of Colorado, Denver
Other
Eligibility
18 Years to 40 Years
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2028
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Jun 24, 2026 · Synced Sep 13, 2026, 9:31 PM EDT