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ClinicalTrials.gov public records Last synced Oct 2, 2026, 11:20 AM EDT

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Showing 49–72 of 259 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: Circadian Rhythm Clear all
Not listed Not applicable Interventional Accepts healthy volunteers

Improving Metabolic & Mental Health in Female Healthcare Shift Workers

NCT06158204
View directory record Official record
Conditions
Sleep, Inadequate, Overweight and Obesity, Work Related Stress, Healthy Lifestyle
Interventions
Lifestyle Intervention
Behavioral
Lead sponsor
Auburn University
Other
Eligibility
18 Years to 50 Years · Female only
Enrollment
13 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2025
U.S. locations
1
States / cities
Auburn, Alabama
Source: ClinicalTrials.gov public record
Updated Jan 8, 2025 · Synced Oct 2, 2026, 11:20 AM 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 28, 2012 · Synced Oct 2, 2026, 11:20 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Circadian Rhythms of Aqueous Humor Dynamics in Humans

NCT00572936
View directory record Official record
Conditions
Glaucoma
Interventions
Latanoprost, Dorzolamide, Timolol
Drug
Lead sponsor
University of Nebraska
Other
Eligibility
19 Years and older
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2006 – 2009
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Oct 24, 2023 · Synced Oct 2, 2026, 11:20 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Testing the Effectiveness of an Intervention That Aligns Circadian Rhythm With Daily Activities on Student Flourishing

NCT07410585
View directory record Official record
Conditions
Chronotypes and Health
Interventions
Use of Owaves App
Behavioral
Lead sponsor
University of California, San Diego
Other
Eligibility
18 Years and older
Enrollment
400 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026
U.S. locations
1
States / cities
La Jolla, California
Source: ClinicalTrials.gov public record
Updated Feb 13, 2026 · Synced Oct 2, 2026, 11:20 AM EDT
Not listed Not applicable Interventional Accepts healthy volunteers

Circadian Time Restricted Eating

NCT05628012
View directory record Official record
Conditions
Circadian Rhythm, Cardiometabolic Health, Weight Loss, Cardiovascular Health, Time Restricted Feeding
Interventions
Circadian Based Time Restricted Eating
Behavioral
Lead sponsor
Oregon Health and Science University
Other
Eligibility
18 Years to 40 Years
Enrollment
10 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2024
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Apr 3, 2024 · Synced Oct 2, 2026, 11:20 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Examination of the Dynamic Relationships of Sleep, Physical Activity, and Circadian Rhythmicity With Neurobehavioral Heterogeneity in ADHD

NCT06810180
View directory record Official record
Conditions
Attention Deficit Hyperactivity Disorder (ADHD), Sleep, Physical Activity
Interventions
Go/No-Go Task, Delay discounting task, Mirror Tracing Persistence Task, Spatial Span, Stop Signal Task, Flanker task
Behavioral
Lead sponsor
Hugo W. Moser Research Institute at Kennedy Krieger, Inc.
Other
Eligibility
8 Years to 12 Years
Enrollment
200 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2031
U.S. locations
2
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 9, 2026 · Synced Oct 2, 2026, 11:20 AM 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 2, 2026, 11:20 AM EDT
Terminated Not applicable Interventional Results available

Blind Child Melatonin Treatment Study

NCT00691444
View directory record Official record
Conditions
Blindness
Interventions
Melatonin, Melatonin
Dietary Supplement · Biological
Lead sponsor
Oregon Health and Science University
Other
Eligibility
5 Years to 20 Years
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2015
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Nov 27, 2019 · Synced Oct 2, 2026, 11:20 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Sleep Timing, Eating and Activity Measurement Study

NCT04992611
View directory record Official record
Conditions
Sleep, Circadian Rhythm Disorders, Dietary Habits
Interventions
Sleep Extension (Early), Sleep Extension (Late)
Behavioral
Lead sponsor
Children's Hospital Medical Center, Cincinnati
Other
Eligibility
14 Years to 18 Years
Enrollment
190 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2025
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Sep 22, 2026 · Synced Oct 2, 2026, 11:20 AM EDT
Enrolling by invitation No phase listed Observational

Adult Sleep Health in the Rural Appalachia and Mississippi Delta Region and Its Relationships With Cardiometabolic Health Disparities.

NCT06336525
View directory record Official record
Conditions
Sleep Apnea, Insomnia, Sleep Deprivation, Sleep Disorders, Circadian Rhythm, Sleepiness, Excessive Daytime, Fatigue
Interventions
Not listed
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
25 Years to 65 Years
Enrollment
3,680 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2027
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Oct 27, 2025 · Synced Oct 2, 2026, 11:20 AM EDT
Recruiting No phase listed Observational

Patient Registry of Blind Subjects With Sleep-related Problems

NCT01195558
View directory record Official record
Conditions
Sleep-wake Disorder in Blind Individuals
Interventions
Data collection on blindness and sleep problems
Other
Lead sponsor
Vanda Pharmaceuticals
Industry
Eligibility
Not listed
Enrollment
10,000 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2030
U.S. locations
1
States / cities
Washington D.C., District of Columbia
Source: ClinicalTrials.gov public record
Updated Jun 24, 2020 · Synced Oct 2, 2026, 11:20 AM EDT
Terminated Not applicable Interventional Accepts healthy volunteers Results available

Sleep and Circadian Treatments for Shift Workers

NCT03813654
View directory record Official record
Conditions
Shift-Work Sleep Disorder, Shift-Work Related Sleep Disturbance
Interventions
8-h Afternoon-Evening Sleep, 8-h Free Sleep
Behavioral
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
50 Years to 65 Years
Enrollment
33 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 15, 2025 · Synced Oct 2, 2026, 11:20 AM EDT
Completed No phase listed Observational

Assessing Sleep and Circadian Rhythms in Primary Brain Tumors Patients

NCT04669574
View directory record Official record
Conditions
Sleep Circadian Rhythms, Chronodisruption
Interventions
Not listed
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
18 Years to 99 Years
Enrollment
101 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 2, 2025 · Synced Oct 2, 2026, 11:20 AM 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 20, 2026 · Synced Oct 2, 2026, 11:20 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Circadian Mechanisms Underlying Non-Dipping Blood Pressure in Blacks

NCT03934255
View directory record Official record
Conditions
Circadian Rhythm, Blood Pressure
Interventions
Constant Routine Protocol
Other
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
18 Years and older
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2020 – 2023
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Jun 8, 2023 · Synced Oct 2, 2026, 11:20 AM EDT
Completed Phase 4 Interventional Results available

Ramelteon in the Treatment of Sleep and Mood in Patients With Seasonal Affective Disorder

NCT00502320
View directory record Official record
Conditions
Seasonal Affective Disorder
Interventions
Ramelteon, Placebo
Drug
Lead sponsor
Lehigh Valley Hospital
Other
Eligibility
18 Years to 65 Years
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
1
States / cities
Allentown, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Oct 6, 2009 · Synced Oct 2, 2026, 11:20 AM EDT
Completed Phase 1 Interventional

Treatment Strategies for Children With Smith-Magenis Syndrome

NCT00506259
View directory record Official record
Conditions
Developmental Delay Disorders, Chromosome Deletion, Mental Retardation, Sleep Disorders, Circadian Rhythm, Self Injurious Behavior
Interventions
dTR Melatonin (NIH CC PDS), Phototherapy (Bright Light), Melatonin CR
Drug · Device
Lead sponsor
National Human Genome Research Institute (NHGRI)
NIH
Eligibility
3 Years to 45 Years
Enrollment
23 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2018
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Dec 12, 2019 · Synced Oct 2, 2026, 11:20 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

The Influence of Sleep on Cardiovascular Outcomes

NCT06535178
View directory record Official record
Conditions
Circadian Rhythm, Cardiometabolic Health, Vascular Health, Pain
Interventions
Sleep Regularity Group
Behavioral
Lead sponsor
Oregon Health and Science University
Other
Eligibility
18 Years to 50 Years
Enrollment
30 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Nov 10, 2025 · Synced Oct 2, 2026, 11:20 AM EDT
Recruiting Not applicable Interventional

The Impact of Overnight Nutrition Support on Sleep and Circadian Rhythm Disruption in the ICU

NCT04737200
View directory record Official record
Conditions
Feeding Patterns, Sleep, Glucose Intolerance
Interventions
Time-of-day of enteral nutrition provision (daytime first), Time-of-day of enteral nutrition provision (nighttime first)
Dietary Supplement
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2027
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 19, 2026 · Synced Oct 2, 2026, 11:20 AM EDT
Enrolling by invitation Not applicable Interventional Accepts healthy volunteers

Real-World Use of an iPad-Based Light Therapy App, With Optional Biomarker Collection

NCT07744711
View directory record Official record
Conditions
Circadian Rhythms
Interventions
Circadian OS iPad-based light app
Device
Lead sponsor
Circadian OS, Inc
Industry
Eligibility
18 Years and older
Enrollment
50 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2026 – 2028
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Aug 4, 2026 · Synced Oct 2, 2026, 11:20 AM EDT
Completed Not applicable Interventional Results available

Zolpidem CR and Hospitalized Patients With Dementia

NCT00814502
View directory record Official record
Conditions
Dementia, Alzheimer Disease, Dementia, Vascular, Sleep Disorders, Circadian Dysregulation
Interventions
Zolpidem CR, Placebo
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
60 Years to 99 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2013
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 22, 2017 · Synced Oct 2, 2026, 11:20 AM EDT
Active, not recruiting No phase listed Observational Accepts healthy volunteers

Couples Health Aging, Rhythms and Sleep Study

NCT05952284
View directory record Official record
Conditions
Aging, Memory Loss
Interventions
Not listed
Lead sponsor
University of Utah
Other
Eligibility
50 Years and older
Enrollment
340 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2027
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Feb 13, 2026 · Synced Oct 2, 2026, 11:20 AM EDT
Recruiting Not applicable Interventional

The Acute T-Rex (Timing of Resistance Exercise) Study

NCT06366399
View directory record Official record
Conditions
Diabetes Mellitus, Type 2, Insulin Resistance, Glucose Intolerance, Sleep Disturbance, Overweight or Obesity, Insulin Sensitivity
Interventions
Resistance Exercise Timing
Behavioral
Lead sponsor
University of Utah
Other
Eligibility
50 Years to 74 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2025
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Apr 3, 2025 · Synced Oct 2, 2026, 11:20 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Influence of Sleep Regularity on Circadian Rhythms, Learning, Performance, and Mood

NCT02839070
View directory record Official record
Conditions
Physiology
Interventions
Sleep/Wake Schedule
Other
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years to 35 Years
Enrollment
27 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2025
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jan 20, 2026 · Synced Oct 2, 2026, 11:20 AM EDT