Sleep QualityNCT07387783
Sleep Quality and Cognitive Functions in Adults: A Cross-Sectional Study
An observational study of Sleep Quality and Cognitive Functions, run by Uskudar University at 1 site in Turkey (Türkiye).
Trial summary
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… Read more about this study
- Who is it for?
- Ages 18 to 35 yearsHealthy volunteers can take part
- Conditions the study is for
- Sleep Quality, Cognitive Functions
- How many people
- 75 participants
- Where
- 1 siteTurkey (Türkiye)
- Study dates
- 26 Jan 2026to Aug 2026
- Phase
- Observational
- Are there results?
- Not yet: the study is under way
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 35 years
- All sexes
- Healthy volunteers accepted
- Adult
Study population: The study population consists of healthy young adults aged between 18 and 35 years. Participants are recruited from a non-clinical population and are required to be fluent in Turkish to ensure valid administration of cognitive assessments. Individuals with self-reported good general health and without active medical, neurological, or psychiatric conditions that may affect sleep or cognitive functioning are eligible. All participants are able and willing to comply with the study procedures, including wearing a wearable sleep monitoring device for five consecutive days and completing a single-session cognitive assessment.
Who may be able to join
- 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
Who cannot join
- 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.
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- 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.
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
Turkey (Türkiye)1 site, 1 recruiting
- Recruiting
Üsküdar University
Istanbul
Fatma Demir, MSc, (0216) 400 22 22, fatma.demir@uskudar.edu.tr
About this study
Official title: The Association Between Sleep Quality and Cognitive Functions in Healthy Young Adults
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.
Read the detailed description
This study is designed as an observational, cross-sectional investigation conducted in healthy young adults to examine the association between sleep quality and cognitive functions. Participants will be recruited from a non-clinical population and will undergo a single assessment period. Subjective sleep quality will be assessed using the Pittsburgh Sleep Quality Index (PSQI), a self-report questionnaire evaluating sleep quality and sleep-related disturbances over the previous month. In addition to subjective measures, objective sleep parameters will be collected using a wearable device worn continuously for five consecutive days. Wearable-derived sleep metrics will include total sleep time, sleep efficiency, sleep onset latency, and wake after sleep onset, as provided by the device's standard algorithms. Cognitive functions will be evaluated during a single in-person assessment session following completion of the sleep data collection period. Cognitive assessment will include standardized neuropsychological tests measuring attention, executive functions, and verbal memory. Attention and executive functions will be assessed using the Victoria Stroop Test, and verbal memory processes will be evaluated using the Öktem Verbal Memory Processes Test, administered according to standardized procedures. Demographic information and relevant background variables will be collected to characterize the study sample. Statistical analyses will primarily focus on examining associations between subjective and objective sleep parameters and cognitive test outcomes. Correlation analyses and multivariable statistical models may be used to explore relationships between sleep quality and cognitive performance while accounting for potential confounding variables. This study aims to contribute to the understanding of how variations in sleep quality are associated with cognitive functioning in healthy young adults, using both subjective and objective sleep measures.
- Conditions
- Sleep Quality, Cognitive Functions
- Keywords
- sleep quality, Cognitive Function, Young Adults, verbal memory, wearable device
- Medical subject headings
- Sleep Initiation and Maintenance Disorders
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
| Study group | Role | What they receive |
|---|---|---|
| Healthy Young Adults | Healthy young adult participants without diagnosed neurological, psychiatric, or sleep disorders who undergo assessment of sleep quality and cognitive functions during a single observational assessment period. |
What is being measured
The primary outcome is the main question the study is designed to answer.
Composite Objective Sleep Quality Index Derived From Wearable Device
A composite objective sleep quality index will be derived from wearable device data collected continuously over five consecutive days. The composite score will be calculated by combining standardized values of total sleep time, sleep efficiency, sleep onset latency, and wake after sleep onset into a single summary measure representing overall objective sleep quality.
Measured: During 5 consecutive days around baseline assessment
Secondary outcomes (3)
Sleep Quality (Pittsburgh Sleep Quality Index Scores)
Subjective sleep quality will be assessed using the Pittsburgh Sleep Quality Index (PSQI). The total PSQI score ranges from 0 to 21, with higher scores indicating poorer sleep quality.
Measured: Baseline (single assessment)
Cognitive Performance (Victoria Stroop Test Scores)
Attention and executive functions will be assessed using the Victoria Stroop Test. Outcome measures include completion time and error scores obtained during the test.
Measured: Baseline (single assessment)
Verbal Memory Performance (Öktem Verbal Memory Processes Test Scores)
Verbal memory will be evaluated using the Öktem Verbal Memory Processes Test. Outcome measures include standardized scores reflecting learning and recall performance.
Measured: Baseline (single assessment)
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted4 Feb 2026
- Study start26 Jan 2026
- Primary completionJun 2026 (estimated)
- Study completionAug 2026 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Sleep QualityStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Observational
- Observational model
- Other
- Time perspective
- Cross-sectional
- Enrolment
- 75 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Uskudar University
- Sponsor type
- University, hospital or other
- Collaborators
- The Scientific and Technological Research Council of Turkey
- Responsible party
- Principal investigator, Fatma Demir, Uskudar University
- Investigators
- Fatma Demir, MSc, Principal investigator, Üsküdar University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07387783
- Sponsor's protocol ID
- 61351342/020-1143
- Other IDs
- TUBITAK 2209A 1919B012466805
- Status last verified
- Apr 2026
- First submitted
- 21 Jan 2026
- Last updated
- 29 Apr 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No: Individual participant data will not be shared because the study involves sensitive personal data related to sleep patterns and cognitive performance, and participant consent for data sharing was not obtained. Data will be used solely for the purposes defined in the approved study protocol.
Study at a glance
From the registry record, last updated by the sponsor on 29 Apr 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- The Association Between Sleep Quality and Cognitive Functions in Healthy Young Adults
- ClinicalTrials.gov ID
- NCT07387783
- Acronym / sponsor ID
- 61351342/020-1143
- Conditions
- Sleep Quality, Cognitive Functions
- Keywords
- sleep quality, Cognitive Function, Young Adults, verbal memory, wearable device
- Study type
- Observational
- Recruitment status
- Recruiting
- Enrolment
- 75 participants (estimated)
- Lead sponsor
- Uskudar UniversityUniversity, hospital or other
- Collaborators
- The Scientific and Technological Research Council of Turkey
- Study start
- 26 Jan 2026 (actual)
- Primary completion
- Jun 2026 (estimated)
- Study completion
- Aug 2026 (estimated)
- First posted
- 4 Feb 2026 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
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.
Detailed description
This study is designed as an observational, cross-sectional investigation conducted in healthy young adults to examine the association between sleep quality and cognitive functions. Participants will be recruited from a non-clinical population and will undergo a single assessment period. Subjective sleep quality will be assessed using the Pittsburgh Sleep Quality Index (PSQI), a self-report questionnaire evaluating sleep quality and sleep-related disturbances over the previous month. In addition to subjective measures, objective sleep parameters will be collected using a wearable device worn continuously for five consecutive days. Wearable-derived sleep metrics will include total sleep time, sleep efficiency, sleep onset latency, and wake after sleep onset, as provided by the device's standard algorithms. Cognitive functions will be evaluated during a single in-person assessment session following completion of the sleep data collection period. Cognitive assessment will include standardized neuropsychological tests measuring attention, executive functions, and verbal memory. Attention and executive functions will be assessed using the Victoria Stroop Test, and verbal memory processes will be evaluated using the Öktem Verbal Memory Processes Test, administered according to standardized procedures. Demographic information and relevant background variables will be collected to characterize the study sample. Statistical analyses will primarily focus on examining associations between subjective and objective sleep parameters and cognitive test outcomes. Correlation analyses and multivariable statistical models may be used to explore relationships between sleep quality and cognitive performance while accounting for potential confounding variables. This study aims to contribute to the understanding of how variations in sleep quality are associated with cognitive functioning in healthy young adults, using both subjective and objective sleep measures.
Study design
- Observational model
- Other
- Time perspective
- Cross-sectional
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| Healthy Young Adults | – | –Healthy young adult participants without diagnosed neurological, psychiatric, or sleep disorders who undergo assessment of sleep quality and cognitive functions during a single observational assessment period. |
Who may qualify
- Ages
- 18 to 35 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult
- Study population
- The study population consists of healthy young adults aged between 18 and 35 years. Participants are recruited from a non-clinical population and are required to be fluent in Turkish to ensure valid administration of cognitive assessments. Individuals with self-reported good general health and without active medical, neurological, or psychiatric conditions that may affect sleep or cognitive functioning are eligible. All participants are able and willing to comply with the study procedures, including wearing a wearable sleep monitoring device for five consecutive days and completing a single-session cognitive assessment.
Key inclusion criteria (6 listed)
- 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.
Key exclusion criteria (10 listed)
- 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.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Primary outcome
Composite Objective Sleep Quality Index Derived From Wearable Device
Time frame: During 5 consecutive days around baseline assessment
A composite objective sleep quality index will be derived from wearable device data collected continuously over five consecutive days. The composite score will be calculated by combining standardized values of total sleep time, sleep efficiency, sleep onset latency, and wake after sleep onset into a single summary measure representing overall objective sleep quality.
3 secondary outcomes
Sleep Quality (Pittsburgh Sleep Quality Index Scores)
Time frame: Baseline (single assessment)
Cognitive Performance (Victoria Stroop Test Scores)
Time frame: Baseline (single assessment)
Verbal Memory Performance (Öktem Verbal Memory Processes Test Scores)
Time frame: Baseline (single assessment)
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 29 Apr 2026.
- Individual participant dataSharing planned: No. Individual participant data will not be shared because the study involves sensitive personal data related to sleep patterns and cognitive performance, and participant consent for data sharing was not obtained. Data will be used solely for the purposes defined in the approved study protocol.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part.
Fatma Demir, MSc principal investigator
Üsküdar University
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Sleep Quality and Cognitive Functions, run by Uskudar University at 1 site in Turkey (Türkiye).
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 6 inclusion and 10 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: looking for participants now, as of the sponsor's last update on 29 Apr 2026. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Turkey (Türkiye). Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Fatma Demir ((0216) 400 22 22, fatma.demir@uskudar.edu.tr), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Composite Objective Sleep Quality Index Derived From Wearable Device (time frame: During 5 consecutive days around baseline assessment). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 29 Apr 2026.