{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Circadian+Rhythms&page=9",
    "query": {
      "condition": "Circadian Rhythms",
      "page": 9
    },
    "page_size": 10
  },
  "pagination": {
    "page": 9,
    "page_size": 10,
    "total_count": 258,
    "total_pages": 26,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Circadian+Rhythms&page=10&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Circadian+Rhythms&page=8&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-24T14:20:24.472Z",
  "attribution": "Data derived from public ClinicalTrials.gov records. The official record at https://clinicaltrials.gov/ remains the source of truth for current availability, contacts, and full study details.",
  "notes": [
    "This endpoint exposes only public summary fields — no participant contact emails, phone numbers, or scraped investigator contact details.",
    "For contact information and full protocol detail, follow each trial's `official_url` to the ClinicalTrials.gov record.",
    "This API is a navigational aid. It does not provide medical advice, eligibility determinations, or compensation guarantees."
  ],
  "trials": [
    {
      "nct_id": "NCT04350567",
      "title": "Sleep/Wake Cycle and Depression: An Imaging and Treatment Study",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Depression; Major Depressive Disorder"
      ],
      "interventions": [
        {
          "name": "Sleep Deprivation",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Stony Brook University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "100 Years",
        "sex": "ALL",
        "summary": "18 Years to 100 Years"
      },
      "enrollment_count": 61,
      "start_date": "2020-09-01",
      "completion_date": "2025-05-31",
      "has_results": false,
      "last_update_posted_date": "2025-07-17",
      "last_synced_at": "2026-10-24T14:20:24.472Z",
      "location_count": 1,
      "location_summary": "Stony Brook, New York",
      "locations": [
        {
          "city": "Stony Brook",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04350567"
    },
    {
      "nct_id": "NCT03468400",
      "title": "Evaluation of the Reliability and Validity of a Diagnostic Sleep Disorders Questionnaire",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Sleep Apnea Syndromes",
        "Insomnia",
        "Insufficient Sleep Syndrome",
        "Circadian Rhythm Disorders"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Dayzz Live Well Ltd.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "21 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "21 Years to 65 Years"
      },
      "enrollment_count": 250,
      "start_date": "2018-03-01",
      "completion_date": "2019-09-30",
      "has_results": false,
      "last_update_posted_date": "2020-07-22",
      "last_synced_at": "2026-10-24T14:20:24.472Z",
      "location_count": 1,
      "location_summary": "Baltimore, Maryland",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03468400"
    },
    {
      "nct_id": "NCT07441265",
      "title": "Does Circadian Misalignment Have Sex-Specific Effects on Metabolism?",
      "overall_status": "NOT_YET_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Circadian Misalignment",
        "Sex Differences"
      ],
      "interventions": [
        {
          "name": "Day shift",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Night shift",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Brigham and Women's Hospital",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "40 Years",
        "sex": "ALL",
        "summary": "18 Years to 40 Years"
      },
      "enrollment_count": 36,
      "start_date": "2026-10-01",
      "completion_date": "2030-09-30",
      "has_results": false,
      "last_update_posted_date": "2026-02-27",
      "last_synced_at": "2026-10-24T14:20:24.472Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07441265"
    },
    {
      "nct_id": "NCT01542151",
      "title": "Effects of Sleep, Fatigue, and Timing of Post-dates Inductions Among Nulliparas",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Pregnancy, Prolonged"
      ],
      "interventions": [
        {
          "name": "Time of labor induction",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of California, San Francisco",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "14 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "14 Years and older · Female only"
      },
      "enrollment_count": 72,
      "start_date": "2011-10",
      "completion_date": "2014-11",
      "has_results": false,
      "last_update_posted_date": "2015-03-26",
      "last_synced_at": "2026-10-24T14:20:24.472Z",
      "location_count": 1,
      "location_summary": "Fresno, California",
      "locations": [
        {
          "city": "Fresno",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01542151"
    },
    {
      "nct_id": "NCT00691574",
      "title": "Melatonin Levels in Smith Magenis Syndrome (SMS)",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Chromosome Disorders"
      ],
      "interventions": [
        {
          "name": "Melatonin",
          "type": "DIETARY_SUPPLEMENT"
        },
        {
          "name": "Enviro-light artificial light box",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DIETARY_SUPPLEMENT",
        "DEVICE"
      ],
      "sponsor": "Oregon Health and Science University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "3 Years",
        "maximum_age": "85 Years",
        "sex": "ALL",
        "summary": "3 Years to 85 Years"
      },
      "enrollment_count": 5,
      "start_date": "1998-09",
      "completion_date": "2009-05",
      "has_results": true,
      "last_update_posted_date": "2019-11-27",
      "last_synced_at": "2026-10-24T14:20:24.472Z",
      "location_count": 1,
      "location_summary": "Portland, Oregon",
      "locations": [
        {
          "city": "Portland",
          "state": "Oregon"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00691574"
    },
    {
      "nct_id": "NCT06678880",
      "title": "Sleep and Light Intervention (SALI) for Menopausal Mood Dysfunction",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Depression",
        "Depression During the Menopausal Transition",
        "Menopausal Depression"
      ],
      "interventions": [
        {
          "name": "Phase Advanced Intervention (PAI)",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Phase Delay Intervention (PDI)",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of California, San Diego",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "45 Years",
        "maximum_age": "75 Years",
        "sex": "FEMALE",
        "summary": "45 Years to 75 Years · Female only"
      },
      "enrollment_count": 120,
      "start_date": "2025-03-11",
      "completion_date": "2029-02-28",
      "has_results": false,
      "last_update_posted_date": "2026-08-05",
      "last_synced_at": "2026-10-24T14:20:24.472Z",
      "location_count": 1,
      "location_summary": "San Diego, California",
      "locations": [
        {
          "city": "San Diego",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06678880"
    },
    {
      "nct_id": "NCT07634926",
      "title": "Early Time-Restricted Eating for Cardiovascular Health",
      "overall_status": "NOT_YET_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Hypertension",
        "Breakfast Skipper"
      ],
      "interventions": [
        {
          "name": "Early Time-Restricted Eating (eTRE)",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of Alabama at Birmingham",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "60 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "60 Years and older"
      },
      "enrollment_count": 36,
      "start_date": "2026-11-30",
      "completion_date": "2029-08-31",
      "has_results": false,
      "last_update_posted_date": "2026-09-28",
      "last_synced_at": "2026-10-24T14:20:24.472Z",
      "location_count": 1,
      "location_summary": "Birmingham, Alabama",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07634926"
    },
    {
      "nct_id": "NCT02291003",
      "title": "Identification of Novel Circadian Biomarkers",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Circadian Rhythm Disorders"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Northwestern University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "60 Years",
        "sex": "ALL",
        "summary": "18 Years to 60 Years"
      },
      "enrollment_count": 3,
      "start_date": "2015-01-29",
      "completion_date": "2017-09-30",
      "has_results": false,
      "last_update_posted_date": "2018-08-31",
      "last_synced_at": "2026-10-24T14:20:24.472Z",
      "location_count": 1,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02291003"
    },
    {
      "nct_id": "NCT00891189",
      "title": "Determine the Relationship Between Circadian Rhythms and Nocturnal Asthma",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Asthma"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Northwestern University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "60 Years",
        "sex": "ALL",
        "summary": "18 Years to 60 Years"
      },
      "enrollment_count": 20,
      "start_date": "2009-01",
      "completion_date": "2011-12",
      "has_results": false,
      "last_update_posted_date": "2016-09-23",
      "last_synced_at": "2026-10-24T14:20:24.472Z",
      "location_count": 1,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00891189"
    },
    {
      "nct_id": "NCT04187157",
      "title": "Association Between Light Spectrum and Survival After Cataract Surgery",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Cataract",
        "Age-related Cataract",
        "Circadian Rhythm Disorders",
        "Glaucoma",
        "Age Related Macular Degeneration"
      ],
      "interventions": [
        {
          "name": "Blue-light filtering intraocular lens",
          "type": "DEVICE"
        },
        {
          "name": "Conventional intraocular lens",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "University of Pittsburgh",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "65 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "65 Years and older"
      },
      "enrollment_count": 10192,
      "start_date": "2012-01-01",
      "completion_date": "2019-04-30",
      "has_results": false,
      "last_update_posted_date": "2019-12-05",
      "last_synced_at": "2026-10-24T14:20:24.472Z",
      "location_count": 1,
      "location_summary": "Pittsburgh, Pennsylvania",
      "locations": [
        {
          "city": "Pittsburgh",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04187157"
    }
  ]
}