Sleep quality and cognitive function in young adults

Is this trial a fit for you?

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This is a cross-sectional observational project enrolling healthy adults aged 18–35 to explore links between sleep and cognition. Subjective sleep will be measured with the Pittsburgh Sleep Quality Index and objective sleep metrics will be collected from a wearable device worn continuously for five days. After the sleep monitoring period, participants complete a single in-person neuropsychological session that includes tests of attention, executive function (Victoria Stroop Test), and verbal memory (Öktem Verbal Memory Processes Test). Analyses will examine associations between self-reported and device-derived sleep measures and cognitive test performance while accounting for basic demographic factors.

Why it matters

Who can join: the full rules

Inclusion Criteria:

* Between 18 and 35 years.
* Ability and willingness to provide written informed consent.
* Sufficient ability to read, understand, and communicate in Turkish, the language in which the assessments are administered.
* Self-reported good general health, with no active medical or psychiatric conditions that significantly affect daily functioning.
* Willingness and ability to wear a wearable sleep monitoring device continuously for five consecutive days and to comply with device usage instructions.
* Ability to attend and complete a single-session cognitive assessment

Exclusion Criteria:

* Regular or frequent use of medications known to affect sleep or cognitive function, including sedative-hypnotics, benzodiazepines, antipsychotics, stimulants, opioids, or similar agents.
* Initiation of, or dose changes in, psychotropic medications within the past four weeks.
* Being under the influence of alcohol or illicit substances on the day of cognitive testing.
* Engagement in night shift work or rotating shift schedules within the past one month.
* Travel across time zones resulting in a time difference of two hours or more within the past two weeks.
* Uncontrolled high daily intake of caffeine (e.g., \>400 mg/day) and unwillingness to reduce consumption during the study period.
* Color blindness or other color vision deficiencies, due to their potential impact on Stroop Test performance.
* Dermatological conditions, allergies, or skin lesions at the wrist that prevent wearing the device, or refusal to wear the device as required.
* Acute illness within the past two weeks, including febrile infections, severe pain, or other acute medical conditions that may temporarily affect sleep or cognitive performance.
* Pregnancy or early postpartum period.

Where it's running

• Üsküdar University
  Istanbul, Turkey (Türkiye) Recruiting

Study contacts

• Principal investigator: Fatma Demir, MSc — Üsküdar University
• Study coordinator: Fatma Demir
• Email: fatma.demir@uskudar.edu.tr
• Phone: (0216) 400 22 22

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How to take part

1. Review the eligibility criteria above with your treating physician.
2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.