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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Circadian Clear all
Recruiting Phase 1 Interventional

Ketoconazole Effects on the Daily Cortisol Rhythm in Mild Autonomous Cortisol Secretion

NCT07649317
View directory record Official record
Conditions
Mild Autonomous Cortisol Secretion
Interventions
Ketoconazole
Drug
Lead sponsor
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
NIH
Eligibility
18 Years to 100 Years
Enrollment
36 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 21, 2026 · Synced Jul 22, 2026, 10:42 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Circadian Regulation of Sleep in Habitual Short Sleepers and Long Sleepers

NCT00001546
View directory record Official record
Conditions
Sleep Disorders
Interventions
Not listed
Lead sponsor
National Institute of Mental Health (NIMH)
NIH
Eligibility
Not listed
Enrollment
38 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1996 – 2000
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Jul 22, 2026, 10:42 AM EDT
Terminated No phase listed Observational Accepts healthy volunteers

The Nuvigil and Provigil Pregnancy Registry

NCT01792583
View directory record Official record
Conditions
Narcolepsy, Obstructive Sleep Apnea, Shift Work Sleep Disorder
Interventions
Modafinil/armodafinil
Drug
Lead sponsor
Cephalon, Inc.
Industry
Eligibility
Female only
Enrollment
191 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2009 – 2023
U.S. locations
1
States / cities
West Chester, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Feb 4, 2024 · Synced Jul 22, 2026, 10:42 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Examining the Biological Factors That Affect Sleep Duration

NCT00607204
View directory record Official record
Conditions
Sleep, Circadian Rhythm, Cognitive Performance
Interventions
Not listed
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years to 35 Years
Enrollment
119 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2011
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 30, 2013 · Synced Jul 22, 2026, 10:42 AM EDT
Completed Not applicable Interventional

Improving Well-being by Improving Memory for Treatment for Sleep and Circadian Dysfunction

NCT04373538
View directory record Official record
Conditions
Sleep Disorder, Circadian Dysregulation
Interventions
Trans-C for sleep and circadian function + Memory Support
Behavioral
Lead sponsor
University of California, Berkeley
Other
Eligibility
55 Years and older
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
1
States / cities
Berkeley, California
Source: ClinicalTrials.gov public record
Updated Sep 28, 2021 · Synced Jul 22, 2026, 10:42 AM EDT
Completed Not applicable Interventional Results available

Feasibility Pilot of Bright Light in the Intensive Care Unit

NCT03568045
View directory record Official record
Conditions
Circadian Rhythm Sleep Disorder, Unspecified
Interventions
standard light, 10,000 lux bright light, 4 hours, 10,000 lux bright light, 8 hours
Device
Lead sponsor
Yale University
Other
Eligibility
50 Years and older
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2024
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Jun 16, 2024 · Synced Jul 22, 2026, 10:42 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

CircaHealth Development and Evaluation

NCT03835572
View directory record Official record
Conditions
Health Behavior, Health Knowledge, Attitudes, Practice, Circadian Rhythm
Interventions
CircaHealth: a course on circadian rhythms and health, Sleep hygiene materials
Other
Lead sponsor
University of Miami
Other
Eligibility
Not listed
Enrollment
54 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated May 8, 2019 · Synced Jul 22, 2026, 10:42 AM 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 27, 2012 · Synced Jul 22, 2026, 10:42 AM EDT
Recruiting Not applicable Interventional

Circadian Mechanisms, Glucose, and CV Risks in T1D

NCT06624046
View directory record Official record
Conditions
Type 1 Diabetes (T1D)
Interventions
Sleep stability intervention
Behavioral
Lead sponsor
University of Illinois at Chicago
Other
Eligibility
18 Years to 50 Years
Enrollment
100 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 29, 2026 · Synced Jul 22, 2026, 10:42 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Effect of Morning Light Exposure on Mood

NCT05616819
View directory record Official record
Conditions
Suicidal Ideation, Regulation, Emotion
Interventions
Active light exposure, Placebo light exposure
Other
Lead sponsor
University of Arizona
Other
Eligibility
18 Years to 60 Years
Enrollment
480 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2026
U.S. locations
1
States / cities
Tucson, Arizona
Source: ClinicalTrials.gov public record
Updated Nov 3, 2025 · Synced Jul 22, 2026, 10:42 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Nighttime Synchrony of Your Nutrition and Circadian Health

NCT07329283
View directory record Official record
Conditions
Sleep, Metabolism Changes, Circadian Rhythm, Lifestyle Factors, Sleep Hygiene, Sleep Hygiene, Inadequate, Sleep Deprivation, Insufficient Sleep, Circadian Misalignment, Circadian Dysregulation, Light Exposure
Interventions
Central Clock Misalignment, Peripheral Misalignment
Behavioral
Lead sponsor
University of Utah
Other
Eligibility
18 Years to 35 Years
Enrollment
120 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2031
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Jan 21, 2026 · Synced Jul 22, 2026, 10:42 AM EDT
Completed Not applicable Interventional Results available

Blue Wavelength Light-blocking Glasses in ADHD-Insomnia

NCT01557595
View directory record Official record
Conditions
Attention Deficit Hyperactivity Disorder, Delayed Sleep Phase Type Circadian Rhythm Sleep Disorder
Interventions
Polarized glasses designed to filter out blue light
Device
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
19 Years and older
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2012
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Dec 12, 2017 · Synced Jul 22, 2026, 10:42 AM EDT
Completed Phase 2 Interventional Results available

Study of Lemborexant for Irregular Sleep-Wake Rhythm Disorder and Mild to Moderate Alzheimer's Disease Dementia

NCT03001557
View directory record Official record
Conditions
Irregular Sleep-Wake Rhythm Disorder
Interventions
Lemborexant 2.5 mg, Lemborexant 5 mg, Lemborexant 10 mg, Lemborexant 15 mg, Lemborexant-matched placebo
Drug
Lead sponsor
Eisai Inc.
Industry
Eligibility
60 Years to 90 Years
Enrollment
63 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2020
U.S. locations
37
States / cities
Little Rock, Arkansas • Rogers, Arkansas • Costa Mesa, California + 30 more
Source: ClinicalTrials.gov public record
Updated May 16, 2021 · Synced Jul 22, 2026, 10:42 AM 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 Jul 22, 2026, 10:42 AM EDT
Recruiting Not applicable Interventional

Evaluation of Cognitive Behavioral Therapy for Insomnia (CBT-I) in Individuals With Mild Traumatic Brain Injury (mTBI)

NCT07385105
View directory record Official record
Conditions
Sleep Architecture, Mild Traumatic Brain Injury, Sleep, Sleep and Circadian Problems
Interventions
Cognitive behavioral Therapy for insomnia (CBT-I)
Behavioral
Lead sponsor
University of Missouri-Columbia
Other
Eligibility
18 Years to 60 Years
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
Columbia, Missouri
Source: ClinicalTrials.gov public record
Updated Apr 30, 2026 · Synced Jul 22, 2026, 10:42 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Understanding Circadian Responses to Light in Persons With Mild Cognitive Impairment

NCT05411822
View directory record Official record
Conditions
Mild Cognitive Impairment, Alzheimer Disease
Interventions
Lighting Intervention Blue light, Lighting Intervention Green light, Dim-light control condition
Device · Other
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
55 Years and older
Enrollment
36 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2024
U.S. locations
1
States / cities
Menands, New York
Source: ClinicalTrials.gov public record
Updated Jun 23, 2025 · Synced Jul 22, 2026, 10:42 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 2, 2024 · Synced Jul 22, 2026, 10:42 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Daytime vs. Delayed Eating Among Obese Individuals

NCT03354169
View directory record Official record
Conditions
Obesity
Interventions
Eating Condition, No Intervention; withdrawn before randomization
Behavioral · Other
Lead sponsor
University of Pennsylvania
Other
Eligibility
21 Years to 50 Years
Enrollment
38 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2023
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Nov 20, 2025 · Synced Jul 22, 2026, 10:42 AM 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 Jul 22, 2026, 10:42 AM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Cardiovascular Risk and Circadian Misalignment in Short Sleepers - Role of Extended Eating Period

NCT06070194
View directory record Official record
Conditions
Sleep Deprivation
Interventions
Time restricted eating (TRE)
Behavioral
Lead sponsor
Pennington Biomedical Research Center
Other
Eligibility
18 Years to 45 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2028
U.S. locations
1
States / cities
Baton Rouge, Louisiana
Source: ClinicalTrials.gov public record
Updated Feb 9, 2026 · Synced Jul 22, 2026, 10:42 AM EDT
Active, not recruiting Not applicable Interventional Accepts healthy volunteers

Maintaining Behavior Change: An Evaluation of a Habit-based Sleep Health Intervention

NCT05167695
View directory record Official record
Conditions
Circadian Dysregulation
Interventions
Habit-based Sleep Health Intervention, Text messaging intervention
Behavioral
Lead sponsor
University of California, Berkeley
Other
Eligibility
18 Years to 30 Years
Enrollment
160 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2026
U.S. locations
1
States / cities
Berkeley, California
Source: ClinicalTrials.gov public record
Updated Nov 4, 2025 · Synced Jul 22, 2026, 10:42 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers

The Music, Sleep and Dementia Study

NCT04157244
View directory record Official record
Conditions
Dementia, Alzheimer Disease, Circadian Rhythm Disorders, Circadian Rhythm Sleep Disorder, Insomnia, Hypersomnia, Cognitive Impairment, Cognitive Decline, Mild Cognitive Impairment, Frontotemporal Dementia, Neurocognitive Disorders, Vascular Dementia, Sleep Disorder, Memory Impairment
Interventions
Tailored music listening intervention
Behavioral
Lead sponsor
University of Pennsylvania
Other
Eligibility
18 Years to 110 Years
Enrollment
32 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2021
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jan 12, 2021 · Synced Jul 22, 2026, 10:42 AM EDT
Not yet recruiting Not applicable Interventional

Understanding the Impact of Meal Timing on Neurological Health in Adults With Multiple Sclerosis

NCT07475377
View directory record Official record
Conditions
Multiple Sclerosis
Interventions
Time Restricted Eating, Unrestricted eating
Behavioral
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
18 Years to 64 Years
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Jul 12, 2026 · Synced Jul 22, 2026, 10:42 AM EDT
Recruiting Not applicable Interventional

The Ambient Light Multiple Myeloma Study

NCT05737732
View directory record Official record
Conditions
Multiple Myeloma
Interventions
Circadian Effective Lighting, Circadian Ineffective Lightning (CIL)
Device
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
21 Years and older
Enrollment
200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
2
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jun 11, 2026 · Synced Jul 22, 2026, 10:42 AM EDT