Sleep Quality and Cognitive Functions in Adults: A Cross-Sectional Study

Recruiting now

Conditions studied: Sleep Quality, Cognitive Functions

In brief

This observational cross-sectional study aims to examine the association between sleep quality and cognitive functions in healthy young adults. Subjective sleep quality will be assessed using the Pittsburgh Sleep Quality Index, and objective sleep parameters will be collected using a wearable device over five consecutive days. Cognitive functions will be evaluated at a single assessment session using standardized neuropsychological tests, including measures of attention, executive functions, and verbal memory. The study seeks to explore relationships between subjective and objective sleep measures and cognitive performance. Findings from this study may contribute to a better understanding of how sleep quality is associated with cognitive functioning in healthy young adults.

Key facts

Study ID

NCT07387783

Run by

Uskudar University

People needed

75

Starts

2026-01-26

Expected to finish

2026-08-01

Last updated by the study team

2026-04-29

Who can join

Age: 18 and older, up to 35. Sex: any. Healthy volunteers: accepted.

You may qualify if…

• 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

You may not qualify if…

• 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 is running

• Üsküdar University — Istanbul, Turkey (Türkiye) (enrolling)

Full record on ClinicalTrials.gov

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