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Showing 1–24 of 226 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Circadian Rhythm Disorders Clear all
Recruiting Not applicable Interventional

Healthy Lifestyles for Bipolar Disorder

NCT06188754
View directory record Official record
Conditions
Time Restricted Eating, Diet, Mediterranean
Interventions
Time restricted eating, Mediterranean diet
Behavioral
Lead sponsor
University of California, Berkeley
Other
Eligibility
18 Years to 65 Years
Enrollment
300 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2029
U.S. locations
1
States / cities
Berkeley, California
Source: ClinicalTrials.gov public record
Updated Aug 3, 2026 · Synced Sep 4, 2026, 11:33 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Comprehensive Police Fatigue Management Program

NCT00246051
View directory record Official record
Conditions
Sleep Disorders, Sleep Apnea, Obstructive, Restless Legs Syndrome, Sleep Disorders, Circadian Rhythm, Sleep Initiation and Maintenance Disorders
Interventions
Sleep Hygiene Education, Expert-Led Sleep Disorders Screening and Treatment, Online Sleep Disorders Screening
Behavioral · Other
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years and older
Enrollment
683 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2010
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 14, 2013 · Synced Sep 4, 2026, 11:33 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Simulated Dawn Med Students

NCT02088593
View directory record Official record
Conditions
Depression, Anxiety, Fatigue, Sleepiness, Sleep Disruption
Interventions
Simulated Dawn Light Box, Sleep Hygiene instructions
Device · Behavioral
Lead sponsor
Medical University of South Carolina
Other
Eligibility
18 Years and older
Enrollment
46 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2007 – 2010
U.S. locations
1
States / cities
Buffalo, New York
Source: ClinicalTrials.gov public record
Updated May 23, 2023 · Synced Sep 4, 2026, 11:33 PM EDT
Recruiting Phase 4 Interventional Accepts healthy volunteers

Lemborexant in Delayed Sleep Phase Syndrome

NCT06874855
View directory record Official record
Conditions
Delayed Sleep Phase Syndrome
Interventions
Lemborexant, Placebo
Drug
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years and older
Enrollment
15 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2023 – 2027
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Jun 4, 2026 · Synced Sep 4, 2026, 11:33 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Skeletal Response to Simulated Night Shift

NCT05074277
View directory record Official record
Conditions
Osteoporosis, Circadian Rhythm Sleep Disorder, Shift Work Type
Interventions
Simulated short term night shift work schedule
Behavioral
Lead sponsor
University of Colorado, Denver
Other
Eligibility
20 Years to 40 Years
Enrollment
20 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2025
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Dec 21, 2025 · Synced Sep 4, 2026, 11:33 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Evaluation of the Reliability and Validity of a Diagnostic Sleep Disorders Questionnaire

NCT03468400
View directory record Official record
Conditions
Sleep Apnea Syndromes, Insomnia, Insufficient Sleep Syndrome, Circadian Rhythm Disorders
Interventions
Not listed
Lead sponsor
Dayzz Live Well Ltd.
Industry
Eligibility
21 Years to 65 Years
Enrollment
250 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2018 – 2019
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 21, 2020 · Synced Sep 4, 2026, 11:33 PM 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 Sep 4, 2026, 11:33 PM EDT
Completed Not applicable Interventional Results available

Efficacy Study of Light Therapy as an Adjunctive Treatment for Parkinson's Disease

NCT02175472
View directory record Official record
Conditions
Parkinson Disease
Interventions
Spectramax light therapy device, Control light device
Device
Lead sponsor
PhotoPharmics, Inc.
Industry
Eligibility
45 Years and older
Enrollment
92 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
2
States / cities
Boston, Massachusetts • Orem, Utah
Source: ClinicalTrials.gov public record
Updated Oct 22, 2018 · Synced Sep 4, 2026, 11:33 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Effects of Sex Hormones on Circadian Rhythm in Men and Women

NCT00001285
View directory record Official record
Conditions
Bipolar Disorder, Circadian Rhythm, Depressive Disorder
Interventions
Not listed
Lead sponsor
National Institute of Mental Health (NIMH)
NIH
Eligibility
Female only
Enrollment
73 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1991 – 2000
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Sep 4, 2026, 11:33 PM EDT
Recruiting Not applicable Interventional

Phase 2 - Rhythmic Light Therapy for Alzheimer's Disease Patients

NCT05016219
View directory record Official record
Conditions
Mild Cognitive Impairment
Interventions
Circadian-Effective Light, Rhythmic Light, Placebo Light, Placebo Rhythmic Light
Device
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
55 Years and older
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
2
States / cities
Menands, New York • New York, New York
Source: ClinicalTrials.gov public record
Updated May 28, 2026 · Synced Sep 4, 2026, 11:33 PM EDT
Withdrawn Early Phase 1 Interventional

Dopamine Rhythms in Health and Addiction

NCT02233829
View directory record Official record
Conditions
Cocaine Abuse
Interventions
Brain Dopamine Reactivity, Brain Dopamine Receptor
Drug · Radiation
Lead sponsor
National Institute on Alcohol Abuse and Alcoholism (NIAAA)
NIH
Eligibility
21 Years to 55 Years
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Apr 23, 2024 · Synced Sep 4, 2026, 11:33 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

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 Dec 17, 2025 · Synced Sep 4, 2026, 11:33 PM EDT
Recruiting Not applicable Interventional Accepts healthy volunteers

Circadian Rhythms in Postmenopausal Women

NCT04893226
View directory record Official record
Conditions
Metabolic Syndrome, Postmenopausal Symptoms
Interventions
Time-Restricted Feeding (TRF)
Behavioral
Lead sponsor
Julie Pendergast
Other
Eligibility
45 Years to 65 Years · Female only
Enrollment
164 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2027
U.S. locations
1
States / cities
Lexington, Kentucky
Source: ClinicalTrials.gov public record
Updated Aug 9, 2026 · Synced Sep 4, 2026, 11:33 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 27, 2012 · Synced Sep 4, 2026, 11:33 PM EDT
Completed Phase 3 Interventional

Tasimelteon for the Treatment of Non-24-hour Sleep-Wake Disorder (N24HSWD) in Blind Individuals With no Light Perception

NCT01429116
View directory record Official record
Conditions
Non-24-Hour Sleep-Wake Disorder
Interventions
tasimelteon
Drug
Lead sponsor
Vanda Pharmaceuticals
Industry
Eligibility
18 Years and older
Enrollment
200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2015
U.S. locations
22
States / cities
Phoenix, Arizona • Orange, California • Palo Alto, California + 19 more
Source: ClinicalTrials.gov public record
Updated Apr 20, 2015 · Synced Sep 4, 2026, 11:33 PM EDT
Recruiting No phase listed Observational Accepts healthy volunteers

Medications for Opioid Use Disorder Photosensitive Retinal Ganglion Cell Function, Sleep, and Circadian Rhythms: Implications for Treatment

NCT06104280
View directory record Official record
Conditions
Opioid Use Disorder, Sleep Disturbance
Interventions
Post-Illumination Pupillary Response (PIPR), Polysomnography, Multiple Sleep Latency Test, Ecological Momentary Assessments, Actigraphy, DLMO, Melatonin Suppression Test
Other · Behavioral · Device
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
18 Years to 80 Years
Enrollment
200 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2025 – 2029
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Aug 10, 2026 · Synced Sep 4, 2026, 11:33 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Rhythmic Light Therapy for Alzheimer's Disease Patients

NCT05015478
View directory record Official record
Conditions
Mild Cognitive Impairment
Interventions
Tailored Rhythmic Lighting Intervention, Placebo Rhythmic Lighting Intervention
Device
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
55 Years and older
Enrollment
52 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2022 – 2023
U.S. locations
2
States / cities
Menands, New York • New York, New York
Source: ClinicalTrials.gov public record
Updated Jun 22, 2026 · Synced Sep 4, 2026, 11:33 PM 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 26, 2025 · Synced Sep 4, 2026, 11:33 PM EDT
Completed Not applicable Interventional Results available

Sustainable Methods, Algorithms, and Research Tools for Delivering Optimal Care Study

NCT02037438
View directory record Official record
Conditions
Obstructive Sleep Apnea of Adult, Insomnia, Circadian Rhythm Sleep Disorder, Sleep Related Movement Disorders, Narcolepsy and Hypersomnia, Parasomnia
Interventions
CONV care for the diagnosis and treatment of sleep disorders, PCCM for the diagnosis and treatment of sleep disorders
Other
Lead sponsor
Stanford University
Other
Eligibility
18 Years and older
Enrollment
1,836 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
1
States / cities
Redwood City, California
Source: ClinicalTrials.gov public record
Updated Mar 3, 2019 · Synced Sep 4, 2026, 11:33 PM EDT
Completed Not applicable Interventional

Implementing and Sustaining a Transdiagnostic Sleep and Circadian Treatment

NCT03556878
View directory record Official record
Conditions
Sleep Disorders, Circadian Rhythm, Sleep Disorder, Acceptability, Feasibility, Adaptation, Implementation Research
Interventions
Fitted Transdiagnostic Sleep and Circadian intervention
Behavioral
Lead sponsor
University of California, Berkeley
Other
Eligibility
18 Years and older
Enrollment
21 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018
U.S. locations
1
States / cities
Berkeley, California
Source: ClinicalTrials.gov public record
Updated Apr 21, 2019 · Synced Sep 4, 2026, 11:33 PM EDT
Recruiting Not applicable Interventional

Feasibility of Light Therapy in the Pediatric Intensive Care Unit (ICU)

NCT07384585
View directory record Official record
Conditions
Circadian Dysregulation, Light Exposure, Pediatric Critical Illness
Interventions
Light Therapy
Other
Lead sponsor
Laura Beth Kalvas
Other
Eligibility
4 Years to 17 Years
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2027
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated May 21, 2026 · Synced Sep 4, 2026, 11:33 PM 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 11, 2019 · Synced Sep 4, 2026, 11:33 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 26, 2019 · Synced Sep 4, 2026, 11:33 PM EDT
Completed Not applicable Interventional Accepts healthy volunteers

Sleep Duration Required to Restore Performance During Chronic Sleep Restriction

NCT01581125
View directory record Official record
Conditions
Sleep, Sleep Deprivation, Insufficient Sleep Syndrome
Interventions
Sleep:wake 1, Sleep:wake 2
Behavioral
Lead sponsor
Brigham and Women's Hospital
Other
Eligibility
18 Years to 35 Years
Enrollment
19 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2016
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 17, 2016 · Synced Sep 4, 2026, 11:33 PM EDT