Medical Information Only. Consult your healthcare provider before considering clinical trial enrollment.
Sleep Disorders, Circadian Rhythm: early-phase trial registry
1 of 5 indexed Sleep Disorders, Circadian Rhythm trials are currently recruiting, with more weight in Phase 1-2.
Corpus placement: #3,391 of 28,707 conditions by registered trial count.
5 US clinical trials · 1 currently recruiting · #3,391 of 28,707 conditions by registered trial count
Sleep Disorders, Circadian Rhythm: 5 US clinical trials tracked, 1 recruiting.
Sleep Disorders, Circadian Rhythm is the subject of 5 registered US clinical trials on ClinicalTrials.gov, 1 of them currently open to new participants. 1 are in Phase 3-4 (later-stage) and 2 in Phase 1-2 (earlier-stage). The most active sponsor is Vanda Pharmaceuticals, running 1 of these trials.
Enrollment posture brief
Registry condition sleep-disorders-circadian-rhythm
OPEN 1 | RECR 20% | LATE 1 | EARLY 2 | RANK #3391 | SPON 1
Volume-matched condition peers
Nearest open-share peer: Accelerated Phase Chronic Myelogenous Leukemia, BCR-ABL1 Positive (20% recruiting · 10 trials)
Sleep Disorders, Circadian Rhythm lists 1 open slots (20% of 5 indexed trials). Peers are matched on registered volume, not therapeutic-area browse lists. How peer matching works →
Key findings
What ClinicalTrials.gov does not surface for Sleep Disorders, Circadian Rhythm on its own pages , computed from the registry mirror as of 2026-08-08. Each line carries its own denominator so it can be quoted as it stands.
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Sleep Disorders, Circadian Rhythm is recruiting below its size-band peers.
1 of 5 indexed trials (20%) are open to enrollment, against a 46.5% average across 27,806 conditions with fewer than 20 trials. The peer set uses the same ClinicalTrials.gov-derived counts as this page.
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One sponsor concentrates Sleep Disorders, Circadian Rhythm research.
Vanda Pharmaceuticals accounts for 1 of 5 trials (20%). 5 distinct sponsors appear on at least one study for this condition label.
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Most Sleep Disorders, Circadian Rhythm trials plan to enrol fewer than 100 people.
Median target enrolment is 23 among the 5 trials that report a genuine target (sentinel values excluded). 4 of those (80%) plan for fewer than 100 participants.
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Sleep Disorders, Circadian Rhythm research is mostly interventional.
5 interventional and 0 observational studies make up this index (100% interventional). Study type is sponsor-reported on ClinicalTrials.gov.
Open and recent trials
5 total, page 1 of 1
Evaluating the Effects of Tasimelteon vs. Placebo in Delayed Sleep-Wake Phase Disorder (DSWPD)
Vanda Pharmaceuticals
NCT04652882
Efficacy of Ramelteon on Speeding Up Sleep in Subjects With Delayed Sleep Phase Syndrome
Takeda
NCT00593736
Treatment Strategies for Children With Smith-Magenis Syndrome
National Human Genome Research Institute (NHGRI)
NCT00506259
Implementing and Sustaining a Transdiagnostic Sleep and Circadian Treatment
University of California, Berkeley
NCT03556878
Effects of Vitamin B12 on the Body's Internal Clock
Brigham and Women's Hospital
NCT00120484
Phase Distribution
| Phase | Trial count |
|---|---|
| Phase 1 | 1 |
| Phase 2 | 1 |
| Phase 3 | 1 |
Top Sponsors
Named interventions
Most-linked intervention names on Sleep Disorders, Circadian Rhythm records (sponsor-reported on ClinicalTrials.gov). Counts are trial links, not unique products.
US sites by state
Facility locations filed on Sleep Disorders, Circadian Rhythm trials. A trial with sites in several states counts in each.
Source: ClinicalTrials.gov, National Library of Medicine. Data is informational only.
Related
What to do with this Sleep Disorders, Circadian Rhythm page
5 registered trials, 1 currently recruiting, is a starting point for a conversation, not a diagnosis or a recommendation.
- 1 Sleep Disorders, Circadian Rhythm trials are currently recruiting, check eligibility criteria before contacting a site. Browse recruiting trials
- Vanda Pharmaceuticals sponsors the most Sleep Disorders, Circadian Rhythm trials on record, review their full trial history before evaluating a specific study. See Vanda Pharmaceuticals's trials
- Bring the specific trial ID (NCT number) to your own doctor before enrolling, this page is a directory, not medical guidance. Read the trial-finding guide
Trial and recruiting counts reflect ClinicalTrials.gov registry status as of the data vintage above; individual trial eligibility and enrollment status can change.
Every figure on PlainTrial is rendered directly from the ClinicalTrials.gov registry, no number is typed in by an editor. This Sleep Disorders, Circadian Rhythm condition card totals 5 registered trials; most-linked intervention Placebo; top US site state California. See our editorial standards & corrections policy, the methodology behind these numbers, the data changelog, or report a data error.