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Later school bells: can a simple schedule change boost teen health?

NCT ID NCT06657482

Knowledge-focused Sponsor: University of Bergen 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
Running, but no longer taking on new participants.
Completed This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 24, 2026 · Last updated Jun 27, 2026 · Updated 2 times

Summary

This completed study in Norway looked at whether delaying school start times by one to two hours on Mondays and Tuesdays helps high school students sleep longer, feel less sleepy during the day, and improve their mental health and grades. Over 580 first-year students participated. The goal was to see if a simple schedule change could make a real difference in teens' well-being.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
delayed school start time
What this could lead to
If successful, this could provide evidence for schools to adopt later start times to help teens sleep better and feel healthier.
What could go wrong
This is a completed observational study, not a treatment trial. Results may not apply to all schools or countries, and benefits might be small or inconsistent.

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.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

583 people

The number who actually took part.

Started

Aug 2023

Finished

Jun 2025

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.

Ages

Children (under 18), adults (18 to 64) and older adults (65 and over)

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: * 1st year high school students at study preparatory program of participating schools Exclusion Criteria: * Parent consent not obtained/documented for participants under 16 years

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Conditions

The condition(s) this trial relates to.

circadian rhythm sleep disorder Disorders of Excessive Somnolence psychiatric disorder sleep disorder

As listed by the trial registrant

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

Psychiatric disorder Sleep Sleep disorders, circadian rhythm Sleepiness, daytime

Contacts and locations

Locations

  • University of Bergen

    Bergen, Vestland, 5019, Norway

More trials for these conditions

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