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Circadian Timing and Time Perception in Healthy Adults

RecruitingNAAges 23 Years - 45 YearsAllUniversity of Aarhus
NCT07292597 on ClinicalTrials.gov ↗
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In plain words

What the trial is, and whether it could suit you

This study examines how a person's natural daily rhythm ("chronotype") affects the way time is experienced and judged. Healthy Danish-speaking adults (23-45 years) who are clearly morning-type or evening-type will complete two lab sessions in a crossover design: one at their preferred time of day (e.g., morning for morning-types) and one at the opposite time (misaligned). In each session, participants do brief computerized tasks that measure time estimation/production, vigilance (psychomotor vigilance task), decision-making, and responses to social information, plus simple color-vision tasks. Short questionnaires about sleepiness, mood, fatigue, and the subjective "passage of time" are collected before, during, and after testing. A subset will wear a wrist actigraphy device for one week beforehand to characterize sleep-wake patterns. Testing is conducted under standardized lab condition

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📋 Eligibility rules (as published)
Inclusion Criteria: * Aged 23 to 45 years * Able to understand and communicate in Danish * Completed at least upper secondary education (e.g., gymnasium) * Categorized as either a Morning Type (MT) or Evening Type (ET) based on standardized chronotype assessments: * Munich Chronotype Questionnaire (MCTQ): * MT: sleep midpoint on free days (MSFsc) ≤ 03:00 * ET: sleep midpoint on free days (MSFsc) ≥ 05:00 * Morningness-Eveningness Questionnaire (MEQ): * One of four defined chronotype categories (definitely morning, moderately morning, moderately evening, definitely evening). Exclusion Criteria: * Current engagement in shift work, rotating schedules, or other forms of irregular sleep-wake timing * Diagnosis of any neurological, psychiatric, or sleep-related disorder (e.g., insomnia, narcolepsy, sleep apnea) * Use of medications that affect sleep, alertness, or circadian functioning (e.g., melatonin, stimulants, antidepressants) * International travel across time zones within the four weeks preceding study participation * Are classified as having an intermediate chronotype based on validated chronotype assessments (MCTQ or MEQ), as this group does not provide the necessary contrast to evaluate circadian alignment effects.
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What it tests

  • Session timing relative to chronotype
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Where

1 site
Cognition and Behavior Lab
Aarhus, Denmark
🤝 Taking part is your choice, and you can leave at any time. Only the trial team can confirm you are eligible — always decide together with your own doctor.
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