# Breath Biomarkers for Sleep Loss and Circadian Timing

> **NCT03980340** · — · TERMINATED · sponsor: **Brigham and Women's Hospital** · enrollment: 5 (actual)

## Conditions studied

- Shift-Work Sleep Disorder
- Shift Work Type Circadian Rhythm Sleep Disorder
- Sleep Disorders, Circadian Rhythm
- Sleep Disorders, Intrinsic
- Advanced Sleep Phase Syndrome (ASPS)
- Advanced Sleep Phase Syndrome
- Advanced Sleep Phase
- Delayed Sleep Phase
- Delayed Sleep Phase Syndrome
- Non-24 Hour Sleep-Wake Disorder
- Irregular Sleep-Wake Syndrome

## Interventions

- **BEHAVIORAL:** Short Nap Intervention
- **BEHAVIORAL:** No Nap Intervention

## Key facts

- **NCT ID:** NCT03980340
- **Lead sponsor:** Brigham and Women's Hospital
- **Sponsor class:** OTHER
- **Phase:** —
- **Study type:** OBSERVATIONAL
- **Status:** TERMINATED
- **Start date:** 2021-01-28
- **Primary completion:** 2025-01-31
- **Final completion:** 2025-03-31
- **Target enrollment:** 5 (ACTUAL)
- **Why stopped:** Funding to carry out studies no longer available.
- **Last updated:** 2025-08-03


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT03980340

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT03980340, "Breath Biomarkers for Sleep Loss and Circadian Timing". Retrieved via AI Analytics 2026-06-24 from https://api.ai-analytics.org/clinical/NCT03980340. Licensed CC0.

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