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NCT00001546 · ClinicalTrials.gov registry record
Circadian Regulation of Sleep in Habitual Short Sleepers and Long Sleepers
A clinical trial of Sleep Disorders, sponsored by National Institute of Mental Health (NIMH).
- Completed
- Registry status
- 38
- Enrollment target
- 1
- Study location
NCT00001546: Completed study of Sleep Disorders, sponsored by National Institute of Mental Health (NIMH).
NCT00001546 is a study of Sleep Disorders that has completed, run by National Institute of Mental Health (NIMH). The registered enrollment target is 38 participants, below the 327-participant average among 19 other Sleep Disorders trials with a reported enrollment target (88% lower). The trial reports 1 study location across 1 state. According to ClinicalTrials.gov, the official US trial registry.
The verdict
NCT00001546, a study of Sleep Disorders, has completed, sponsored by National Institute of Mental Health (NIMH).
- COMPLETED
- Registry status
- 38 participants
- Enrollment target
- 1
- Study location
Study Summary
Routine sleep duration varies greatly among individuals. The biological meaning of this variation is unknown. The term circadian rhythm refers to the biological clock that regulates the timing of falling asleep, waking up, and secretion of hormones, like melatonin. Melatonin is secreted at night. Previous studies have shown that melatonin may play a role in the regulation of sleep. The purpose of this study is to learn whether the duration of nighttime (nocturnal) melatonin secretion is longer in people with long regular sleep duration than people with short sleep duration. Researchers will compare levels of melatonin and cortisol, body temperature, sleepiness, and sleep in two extreme groups. Group one will be made up of people with short sleep duration lasting less than 6 hours. Group two will be made up of people with long sleep duration lasting more than 9 hours.
Conditions Studied
Study Locations (1)
Maryland
- National Institute of Mental Health (NIMH) - Bethesda
Trial Details
| Field | Value |
|---|---|
| Enrollment Target | 38 participants |
| Start Date | 1996-05 |
| Est. Completion | 2000-06 |
What the finished NCT00001546 record still lists
NCT00001546 is an observational study that tracks outcomes without assigning an intervention. The registry caps enrollment at 38 participants, a relatively small participant target, below the 327-participant average among 19 other Sleep Disorders trials with a reported enrollment target (88% lower).
The record links to 1 condition, with Sleep Disorders appearing as the primary indexed condition, and to 0 interventions.
NCT00001546 reports a single indexed study location in Maryland.
Frequently Asked Questions
What is clinical trial NCT00001546 about?
NCT00001546 is a clinical study titled "Circadian Regulation of Sleep in Habitual Short Sleepers and Long Sleepers". Routine sleep duration varies greatly among individuals. The biological meaning of this variation is unknown. The term circadian rhythm refers to the biological clock that regulates the timing of falling asleep, waking up, and secretion of hormones, like melatonin. Melatonin is secreted at night. P...
What is the current status of trial NCT00001546?
This trial is currently completed. The enrollment target is 38 participants. The study started on 1996-05. Estimated completion is 2000-06.
What conditions does trial NCT00001546 study?
This clinical trial studies the following conditions: Sleep Disorders.
Who is sponsoring clinical trial NCT00001546?
This trial is sponsored by National Institute of Mental Health (NIMH), which has 343 total clinical trials registered on ClinicalTrials.gov.
Where is trial NCT00001546 being conducted?
This trial has 1 study location across Maryland. Contact the study sites directly through ClinicalTrials.gov for enrollment availability.
Learn More About Clinical Trials
Similar trials for Sleep Disorders
Matched on the same primary condition, ranked to surface studies in the same phase first, then by recruiting status, no relevance scoring or editorial curation.
Where NCT00001546's enrollment target sits among peer trials
38 12th of 19 higher than 8 of 19 other Sleep Disorders trials
participants (enrollment target), bucketed by value
Each bar is a band; taller bars hold more other Sleep Disorders trials. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source ClinicalTrials.gov registry export · 2026-08-08
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