{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Circadian+Protocol&page=2",
    "query": {
      "intervention": "Circadian Protocol",
      "page": 2
    },
    "page_size": 10
  },
  "pagination": {
    "page": 2,
    "page_size": 10,
    "total_count": 10,
    "total_pages": 1,
    "next_page_url": null,
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Circadian+Protocol&page=1&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-09-28T02:30:38.012Z",
  "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": "NCT03806296",
      "title": "Delayed Sleep Timing in Teens Study",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Delayed Sleep Phase"
      ],
      "interventions": [
        {
          "name": "Increase morning bright light",
          "type": "OTHER"
        },
        {
          "name": "Decrease evening blue light",
          "type": "OTHER"
        },
        {
          "name": "Sleep scheduling",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Monitor sleep, mood, and substance use",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "OTHER",
        "BEHAVIORAL"
      ],
      "sponsor": "University of Pittsburgh",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "16 Years",
        "maximum_age": "19 Years",
        "sex": "ALL",
        "summary": "16 Years to 19 Years"
      },
      "enrollment_count": 142,
      "start_date": "2018-12-03",
      "completion_date": "2024-11-30",
      "has_results": true,
      "last_update_posted_date": "2025-08-26",
      "last_synced_at": "2026-09-28T02:30:38.012Z",
      "location_count": 1,
      "location_summary": "Pittsburgh, Pennsylvania",
      "locations": [
        {
          "city": "Pittsburgh",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03806296"
    },
    {
      "nct_id": "NCT04966351",
      "title": "Countermeasures to Circadian Misalignment",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Circadian Rhythm Sleep Disorder of Shift Work Type",
        "Metabolic Disease",
        "Insulin Sensitivity"
      ],
      "interventions": [
        {
          "name": "Time-restricted feeding",
          "type": "BEHAVIORAL"
        },
        {
          "name": "Circadian Misalignment",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Colorado State University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "35 Years",
        "sex": "ALL",
        "summary": "18 Years to 35 Years"
      },
      "enrollment_count": 32,
      "start_date": "2021-07-07",
      "completion_date": "2026-06-30",
      "has_results": false,
      "last_update_posted_date": "2025-07-24",
      "last_synced_at": "2026-09-28T02:30:38.012Z",
      "location_count": 1,
      "location_summary": "Fort Collins, Colorado",
      "locations": [
        {
          "city": "Fort Collins",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04966351"
    },
    {
      "nct_id": "NCT01276652",
      "title": "Sleep and Circadian Rhythms in Mechanically Ventilated Patients",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Respiratory Failure",
        "Critical Illness"
      ],
      "interventions": [
        {
          "name": "Environmental modification",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of Iowa",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 25,
      "start_date": "2001-11",
      "completion_date": "2008-12",
      "has_results": true,
      "last_update_posted_date": "2017-09-26",
      "last_synced_at": "2026-09-28T02:30:38.012Z",
      "location_count": 1,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01276652"
    },
    {
      "nct_id": "NCT06532773",
      "title": "Mindfulness Intervention for Sleep Disturbance and Symptom Management in Hematologic Cancer Patients During and After Inpatient Treatment",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Hematologic Malignancy"
      ],
      "interventions": [
        {
          "name": "Nite2Day+",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Duke University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 60,
      "start_date": "2026-01-14",
      "completion_date": "2029-06-30",
      "has_results": false,
      "last_update_posted_date": "2026-07-08",
      "last_synced_at": "2026-09-28T02:30:38.012Z",
      "location_count": 1,
      "location_summary": "Durham, North Carolina",
      "locations": [
        {
          "city": "Durham",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06532773"
    },
    {
      "nct_id": "NCT05184933",
      "title": "Sleep and Circadian Mechanisms in Hypertension",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Hypertension",
        "Cardiovascular Diseases",
        "Cardiovascular Risk Factors",
        "Circadian Rhythms",
        "Sleep"
      ],
      "interventions": [
        {
          "name": "At-home Polysomnography",
          "type": "OTHER"
        },
        {
          "name": "Circadian Protocol",
          "type": "OTHER"
        },
        {
          "name": "Rested Wakefulness Trial",
          "type": "OTHER"
        },
        {
          "name": "Overnight Sleep Trial",
          "type": "OTHER"
        },
        {
          "name": "Regularized Sleep Schedule",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "OTHER",
        "BEHAVIORAL"
      ],
      "sponsor": "Oregon Health and Science University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "25 Years",
        "maximum_age": "64 Years",
        "sex": "ALL",
        "summary": "25 Years to 64 Years"
      },
      "enrollment_count": 32,
      "start_date": "2022-08-04",
      "completion_date": "2029-03-30",
      "has_results": false,
      "last_update_posted_date": "2026-02-11",
      "last_synced_at": "2026-09-28T02:30:38.012Z",
      "location_count": 1,
      "location_summary": "Portland, Oregon",
      "locations": [
        {
          "city": "Portland",
          "state": "Oregon"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05184933"
    },
    {
      "nct_id": "NCT05775627",
      "title": "Sleep and Metabolism",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Sleep Deprivation",
        "Obesity",
        "Glucose Intolerance",
        "Weight Gain",
        "Food Selection"
      ],
      "interventions": [
        {
          "name": "Sleep Restriction",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "Oregon Health and Science University",
      "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": 20,
      "start_date": "2023-12-01",
      "completion_date": "2027-06-30",
      "has_results": false,
      "last_update_posted_date": "2024-04-03",
      "last_synced_at": "2026-09-28T02:30:38.012Z",
      "location_count": 1,
      "location_summary": "Portland, Oregon",
      "locations": [
        {
          "city": "Portland",
          "state": "Oregon"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05775627"
    },
    {
      "nct_id": "NCT07465250",
      "title": "Effects of Combined Blue and Red Home-Based Light Therapy on Sleep in Adults With Self-Reported Sleep Difficulties",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Sleep"
      ],
      "interventions": [
        {
          "name": "LED portable light therapy bulb",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Colorado State University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 20,
      "start_date": "2024-07-09",
      "completion_date": "2025-07-07",
      "has_results": false,
      "last_update_posted_date": "2026-03-12",
      "last_synced_at": "2026-09-28T02:30:38.012Z",
      "location_count": 1,
      "location_summary": "Fort Collins, Colorado",
      "locations": [
        {
          "city": "Fort Collins",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07465250"
    },
    {
      "nct_id": "NCT05336084",
      "title": "Circadian Rhythms and Homeostatic Sleep Drive and Their Effect on Reward and Cognitive Control Systems in Adolescents",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Sleep"
      ],
      "interventions": [
        {
          "name": "Ultradian sleep/wake protocol",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of Pittsburgh",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "13 Years",
        "maximum_age": "18 Years",
        "sex": "ALL",
        "summary": "13 Years to 18 Years"
      },
      "enrollment_count": 200,
      "start_date": "2022-03-04",
      "completion_date": "2030-05-31",
      "has_results": false,
      "last_update_posted_date": "2026-04-08",
      "last_synced_at": "2026-09-28T02:30:38.012Z",
      "location_count": 1,
      "location_summary": "Pittsburgh, Pennsylvania",
      "locations": [
        {
          "city": "Pittsburgh",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05336084"
    },
    {
      "nct_id": "NCT06296823",
      "title": "Biomarkers for Peripheral Circadian Clocks in Humans",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Circadian Rhythms"
      ],
      "interventions": [
        {
          "name": "Simulated jetlag protocol",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of Colorado, Boulder",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "17 Years",
        "maximum_age": "35 Years",
        "sex": "ALL",
        "summary": "17 Years to 35 Years"
      },
      "enrollment_count": 14,
      "start_date": "2023-09-01",
      "completion_date": "2027-08-31",
      "has_results": false,
      "last_update_posted_date": "2026-06-17",
      "last_synced_at": "2026-09-28T02:30:38.012Z",
      "location_count": 1,
      "location_summary": "Boulder, Colorado",
      "locations": [
        {
          "city": "Boulder",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06296823"
    },
    {
      "nct_id": "NCT06624046",
      "title": "Circadian Mechanisms, Glucose, and CV Risks in T1D",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Type 1 Diabetes (T1D)"
      ],
      "interventions": [
        {
          "name": "Sleep stability intervention",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BEHAVIORAL"
      ],
      "sponsor": "University of Illinois at Chicago",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "50 Years",
        "sex": "ALL",
        "summary": "18 Years to 50 Years"
      },
      "enrollment_count": 100,
      "start_date": "2025-03-13",
      "completion_date": "2029-08-31",
      "has_results": false,
      "last_update_posted_date": "2026-06-30",
      "last_synced_at": "2026-09-28T02:30:38.012Z",
      "location_count": 1,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06624046"
    }
  ]
}