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Morning larks vs night owls: does your body clock distort time?

NCT ID NCT07677111

Knowledge-focused Sponsor: The Hong Kong Polytechnic University Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
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
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 30, 2026 · Last updated Jul 01, 2026 · Updated 1 time

Summary

This study investigates whether the match between a person's chronotype (morning or evening preference) and the time of day influences how they perceive time. Healthy adults who are clear morning or evening types complete perception and cognition tasks both early in the morning and late in the evening. By testing participants across three countries, the study aims to see if circadian effects on time perception are universal.

What this could mean

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

What this could lead to
If it works, this could reveal how our body clock shapes our sense of time, potentially informing work schedules or therapies for circadian rhythm disorders.
What could go wrong
This is an observational study with no treatment, so it won't directly change medical practice. Results may vary across cultures and may not apply to everyone.

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

About 240 people

The number the study aims to enrol. It can still change while the study runs.

Started

Sep 2025

Expected to finish

Jun 2028

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.

Ages

18 to 55 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: * Healthy adult, 18-40 years * Clear morning-type or evening-type on the Morningness-Eveningness Questionnaire (MEQ-SA); intermediate types excluded (state exact cut-offs, e.g. evening-type 41 or below, morning-type 59 or above) * Normal or corrected-to-normal visual acuity * Normal colour vision (e.g. Ishihara screening) * Fluent in the testing-site language (Danish, Chinese, or English) * Able to attend both an early-morning (about 08:00) and a late-evening (about 22:00) session Exclusion Criteria: * Intermediate chronotype (MEQ in the middle band) * Night or rotating shift work in the past 3 months, or recent trans-meridian travel (more than 2 time zones in the past 4 weeks) * Diagnosed sleep disorder (e.g. insomnia, sleep apnoea) * Current psychiatric or neurological disorder * Use of sleep medication or psychoactive or CNS-active drugs * Colour-vision deficiency * Substance-use disorder

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Conditions

The condition(s) this trial relates to.

circadian rhythm sleep disorder sleep disorder

As listed by the trial registrant

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

Chronotype Circadian rhythm Sleep Time perception

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Child Development Centre

    RECRUITING

    Hong Kong, Hong Kong

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