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The Effect of a Continuous 1-Hour Time Delay on Circadian Rhythms | Clinical Trials | Clareo Health

RECRUITINGNA

The Effect of a Continuous 1-Hour Time Delay on Circadian Rhythms

NCT07317349•University of Aarhus

Summary

The purpose of this study is to investigate whether the experience of a daily time delay can affect our internal circadian rhythm.

Eligibility

Age

23 - 45 years

Sex

ALL

Healthy Volunteers

Yes

Inclusion Criteria

•Healthy adults aged 23-45 years
•Part of a heterosexual, cohabiting couple willing to participate together in a five-day in-laboratory study
•Completion of at least upper-secondary education
•Maintain a regular sleep-wake schedule
•Habitual sleep timing within a normative range (non-extreme chronotype), assessed using the Morningness-Eveningness Questionnaire (MEQ) or the Munich Chronotype Questionnaire (MCTQ)
•Both partners fall within the acceptable chronotype range to ensure aligned sleep-wake patterns
•Low seasonality scores on the Seasonal Pattern Assessment Questionnaire (SPAQ)
•Free from underlying sleep or mood disorders

Exclusion Criteria

•Engages in night-shift work or maintains an irregular work or sleep schedule
•International travel involving a time-zone change of more than two hours within the past two months, or anticipated travel before study completion
•Diagnosed neurological, psychiatric, or sleep disorder (e.g., insomnia, sleep apnea, bipolar disorder)
•High risk of sleep apnea, defined as a Berlin Questionnaire score \>2 (Lauritzen et al., 2018)
•Use of medications known to affect sleep, alertness, melatonin secretion, or circadian timing
•Unable or unwilling to comply with behavioral restrictions, including refraining from electronic devices displaying time cues unless clocks are removed and devices are disconnected from Wi-Fi
•Unable or unwilling to comply with consumption restrictions, including abstaining from caffeine, alcohol, and melatonin-rich foods during the study
•Extreme chronotype, defined as a habitual midsleep time outside 03:00-05:00 on the MCTQ or classification as an extreme morning or extreme evening type on the MEQ
•Daily caffeine consumption exceeding 400 mg (approximately 4-5 cups of coffee)
•Current smoker or smoking within the past six months

Locations (1)

Aarhus University, Department of Psychology and Behavioural Sciences

Aarhus, Denmark

Key Dates

Start Date

December 20, 2025

Primary Completion Date

March 1, 2027

Completion Date

August 30, 2027

Last Updated

January 16, 2026

Enrollment

ESTIMATED participants

Conditions

Circadian RhythmsTime PerceptionSleep

Interventions

Fixed daily routine

BEHAVIORAL

Daily time delay

BEHAVIORAL

Contacts

Ali Amidi, PhD

CONTACT

+4587165305 ali@psy.au.dk

Alisha Guyett, PhD

CONTACT

alisha.guyett@psy.au.dk

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Data Source & Attribution

This clinical trial information is sourced from ClinicalTrials.gov, a service of the U.S. National Institutes of Health.

ClinicalTrials.gov last update: January 16, 2026Data synced to Clareo: March 29, 2026

Modifications: This data has been reformatted for display purposes. Eligibility criteria have been parsed into inclusion/exclusion sections. Location data has been geocoded to enable distance-based search. For the authoritative and most current information, please visit ClinicalTrials.gov.

Neither the United States Government nor Clareo Health make any warranties regarding the data. Check ClinicalTrials.gov frequently for updates.

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The Effect of a Continuous 1-Hour Time Delay on Circadian Rhythms

Inclusion Criteria

Exclusion Criteria

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