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Sleep study tracks hidden health risks for decades

NCT ID NCT00005557

Knowledge-focused Sponsor: University of Wisconsin, Madison Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing This study
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study follows 1,545 adults over many years to understand how sleep-disordered breathing and other sleep problems develop and affect health. Participants were Wisconsin state employees aged 30-60 when the study began. Researchers use overnight sleep tests, questionnaires, and health assessments to explore links to heart disease, stroke, mood disorders, and thinking problems.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

1,545 people

The number who actually took part.

Start date

Apr 1999

Expected to finish

Apr 2031

An estimate. End dates often move.

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

In 1988, employees of 4 Wisconsin state agencies, ages 30-60 years, were surveyed regarding sleep habits and problems by mail. From these data, a sampling frame was constructed and 2884 randomly-selected men and women (of 4896 survey respondents) were invited to participate in the WSC Study. Recruitment for baseline sleep studies occurred from 1989 to 2004.

Ages

30 to 95 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion criteria: * Employee of one of the 4 Wisconsin state agencies * Age 30-60 in 1988 Exclusion criteria: * Current pregnancy * Unstable or decompensated cardiopulmonary disease * Airway cancer * Recent upper respiratory surgery

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Conditions

The condition(s) this trial relates to.

cardiovascular disorder cerebrovascular disorder mood disorder nervous system disorder sleep apnea syndrome sleep-wake disorder

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Cardiovascular disease Cerebrovascular disorders Mood disorders Neurologic disorders Sleep disorders

Contacts and locations

Locations

  • University of Wisconsin Hospital and Clinics

    Madison, Wisconsin, 53705, United States

More trials for these conditions

Other studies related to the condition(s) this trial covers.