Actively Recruiting
The Effect of a Continuous 1-Hour Time Delay on Circadian Rhythms
Led by University of Aarhus · Updated on 2026-01-16
40
Participants Needed
1
Research Sites
88 weeks
Total Duration
On this page
Sponsors
U
University of Aarhus
Lead Sponsor
I
Independent Research Fund Denmark
Collaborating Sponsor
AI-Summary
What this Trial Is About
The purpose of this study is to investigate whether the experience of a daily time delay can affect our internal circadian rhythm.
CONDITIONS
Official Title
The Effect of a Continuous 1-Hour Time Delay on Circadian Rhythms
Who Can Participate
Eligibility Criteria
You may qualify if you...
- Healthy adults aged 23-45 years
- Part of a heterosexual, cohabiting couple willing to participate together in a five-day in-laboratory study
- Both partners meet all inclusion criteria
- Completion of at least upper-secondary education
- Maintain a regular sleep-wake schedule
- Habitual sleep timing within a normative range (non-extreme chronotype), assessed by MEQ or MCTQ
- Both partners have aligned sleep-wake patterns within acceptable chronotype range
- Low seasonality scores on the Seasonal Pattern Assessment Questionnaire (SPAQ)
- Free from underlying sleep or mood disorders
You will not qualify if you...
- Engages in night-shift work or irregular work or sleep schedule
- International travel involving time-zone change >2 hours in past two months or planned before study completion
- Diagnosed neurological, psychiatric, or sleep disorder (e.g., insomnia, sleep apnea, bipolar disorder)
- High risk of sleep apnea (Berlin Questionnaire score >2)
- Use of medications affecting sleep, alertness, melatonin, or circadian timing
- Unable or unwilling to comply with behavioral restrictions (e.g., no electronic devices with time cues)
- Unable or unwilling to comply with consumption restrictions (e.g., abstain from caffeine, alcohol, melatonin-rich foods)
- Extreme chronotype outside 03:00-05:00 midsleep or classified as extreme morning/evening type
- Daily caffeine intake exceeding 400 mg
- Current smoker or smoked within the past six months
AI-Screening
AI-Powered Screening
Complete this quick 3-step screening to check your eligibility
Trial Site Locations
Total: 1 location
1
Aarhus University, Department of Psychology and Behavioural Sciences
Aarhus, Denmark, 8000
Actively Recruiting
Research Team
A
Ali Amidi, PhD
CONTACT
A
Alisha Guyett, PhD
CONTACT
How is the study designed?
Study Type
INTERVENTIONAL
Masking
NONE
Allocation
RANDOMIZED
Model
SINGLE_GROUP
Primary Purpose
BASIC_SCIENCE
Number of Arms
2
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