Sleep QualityNCT07315269
The Relationship Between Power Sleep and Sleep Quality, Depression, and Stress Levels in University Students
A study testing Daytime Power Napping in people with Sleep Quality and Depression Disorders, run by okkes zortuk at 1 site in Turkey (Türkiye).
Trial summary
This prospective cohort study aims to evaluate the effects of daily daytime power napping on sleep quality, depression, and perceived stress levels among healthy individuals. The study particularly investigates whether these effects differ between daytime workers and shift workers. Read more about this study
- Who is it for?
- Ages 18 to 65 yearsHealthy volunteers can take part
- Conditions the study is for
- Sleep Quality, Depression Disorders, Stress, Psychological
- What is being tested?
- Daytime Power Napping
- Type of treatment
- Lifestyle or therapy programme
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 40 participants
- Where
- 1 siteTurkey (Türkiye)
- Study dates
- 1 Dec 2023to 1 Dec 2024
- Phase
- Interventional
- Are there results?
- None posted in the registry
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 65 years
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Who may be able to join
- Being a healthy volunteer.
- Being actively employed as either a daytime worker or a shift worker.
- Providing written informed consent to participate in the study.
- Willingness to adhere to a 6-week daytime power napping protocol.
Who cannot join
- Presence of diagnosed severe sleep disorders (e.g., severe insomnia or sleep apnea) that might interfere with the study protocol.
- Inability to complete the 6-week power napping intervention.
- Missing or incomplete psychological scale data at baseline or post-test.
- Failure to perform the power nap as instructed during the study period.
Trial locations and contacts
1 site in 1 country.
Turkey (Türkiye)1 site
Dicle University
Diyarbakır, Diyarbakar, 21000
About this study
Official title: Evaluation of the Effect of Daytime Power Napping on Depression, Stress and Sleep According to Working Method: Prospective Cohort Study
This prospective cohort study aims to evaluate the effects of daily daytime power napping on sleep quality, depression, and perceived stress levels among healthy individuals. The study particularly investigates whether these effects differ between daytime workers and shift workers. Participants are required to practice a 15-20 minute (maximum 30 minutes) power nap daily for a period of six weeks. Changes in psychological and sleep parameters are assessed using the Jenkins Sleep Scale (JSS), Beck Depression Scale (BDS), and Perceived Stress Scale (PSS) before and after the intervention.
Read the detailed description
The study was conducted with 40 healthy volunteers (including 29 daytime workers and 11 shift workers) to analyze the impact of daytime napping on mental health and sleep hygiene.
Methodology: At the beginning of the study, participants' demographic information was collected, and baseline assessments were performed using the Jenkins Sleep Scale (JSS) for sleep patterns, the Beck Depression Scale (BDS) for depressive symptoms, and the Perceived Stress Scale (PSS) for stress levels.
Intervention: Participants were instructed to take a short nap (power nap) between 1:00 PM and 3:00 PM for daytime workers, or at suitable intervals for shift workers, every day for 6 weeks. The duration of the nap was strictly limited to 15-30 minutes to avoid sleep inertia.
Evaluation: After the 6-week intervention period, the same scales (JSS, BDS, and PSS) were administered as a post-test. The data were analyzed to compare the pre-test and post-test scores, with a focus on the differences in outcomes between different work schedules (shift vs. daytime). The study adheres to the principles of the Declaration of Helsinki and was approved by the Dicle University Social Sciences and Humanities Ethics Committee.
- Being tested
- Daytime Power Napping
- Keywords
- Naps, Power napping, Shift workers, Daytime sleep, Mental health, Prospective cohort study
- Medical subject headings
- Sleep Initiation and Maintenance Disorders, Stress, Psychological, Occupational Stress, Psychological Well-Being
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Daytime Power NappingBehavioural
The duration, effectiveness, and method of intervention in this area should be clearly stated:
Duration Per Session: Each nap is planned to be between 15-20 minutes, and limited to a maximum of 30 minutes to prevent sleepiness (sleep inertia).
Total Duration: The intervention is a 6-week process. Target Group: 40 healthy volunteers (including day and shift workers). Goal: To enhance the privacy of sleep in daily life, reduce virus spread, and decrease stress.
| Study group | Role | What they receive |
|---|---|---|
| Daytime Power Nap Group | Experimental | A group of 40 participants who are instructed to perform a 15-20 minute power nap daily for 6 weeks. Receives: Behavioral: Daytime Power Napping |
What is being measured
The primary outcome is the main question the study is designed to answer.
Change in Sleep Quality as measured by the Jenkins Sleep Scale
The JSS is a 4-item scale used to assess sleep problems, specifically focusing on difficulties falling asleep and maintaining sleep quality. Each item is scored on a 6-point Likert scale (0-20 total range). Higher scores indicate more sleep problems.
Measured: Baseline (Day 0) and at the end of the 6-week intervention period.
Secondary outcomes (2)
Change in Depressive Symptoms as measured by the Beck Depression Scale (BDS/BDI)
The BDS consists of 21 questions designed to assess cognitive, somatic, and emotional symptoms of depression. Scores range from 0 to 63. Higher scores indicate more severe depressive symptoms.
Measured: Baseline (Day 0) and at the end of the 6-week intervention period.
Change in Perceived Stress as measured by the Perceived Stress Scale (PSS).
The 10-item version of the PSS measures an individual's perception of stress in their current situation. It includes two sub-dimensions: "perception of inadequate self-efficacy" and "perception of stress discomfort". Higher scores indicate a higher level of perceived stress.
Measured: Baseline (Day 0) and at the end of the 6-week intervention period.
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted2 Jan 2026
- Study start1 Dec 2023
- Primary completion1 Jan 2024
- Study completion1 Dec 2024
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (3)Papers the sponsor has linked to this study.
- 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
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Supportive care
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Enrolment
- 40 participants (actual)
Sponsor and investigators
- Lead sponsor
- okkes zortuk
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor-investigator, okkes zortuk, Ataturk University
- Investigators
- Ökkeş Zortuk, Principal investigator, Emergency Medicine Department, Defne Government HospitalYeşim Dersuneli, MSc, Study director, Clinical Psychology, Muş Alparslan UniversityÖzlem Tolan, PHd, Study chair, Clinical Psychology, Dicle University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07315269
- Sponsor's protocol ID
- ZTKLAB003102022DSEC23092022237
- Status last verified
- Dec 2023
- First submitted
- 18 Dec 2025
- Last updated
- 2 Jan 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No: To maintain participant confidentiality and comply with the institutional ethics committee's guidelines, individual participant data (IPD) will not be made publicly available. However, metadata and study results are reported within the manuscript.
Publications
Brown JP, Martin D, Nagaria Z, Verceles AC, Jobe SL, Wickwire EM. Mental Health Consequences of Shift Work: An Updated Review. Curr Psychiatry Rep. 2020 Jan 18;22(2):7. doi: 10.1007/s11920-020-1131-z.
PubMed 31955278Faraut B, Boudjeltia KZ, Dyzma M, Rousseau A, David E, Stenuit P, Franck T, Van Antwerpen P, Vanhaeverbeek M, Kerkhofs M. Benefits of napping and an extended duration of recovery sleep on alertness and immune cells after acute sleep restriction. Brain Behav Immun. 2011 Jan;25(1):16-24. doi: 10.1016/j.bbi.2010.08.001. Epub 2010 Aug 8.
PubMed 20699115Juhola J, Arokoski JPA, Ervasti J, Kivimaki M, Vahtera J, Myllyntausta S, Saltychev M. Internal consistency and factor structure of Jenkins Sleep Scale: cross-sectional cohort study among 80 000 adults. BMJ Open. 2021 Jan 18;11(1):e043276. doi: 10.1136/bmjopen-2020-043276.
PubMed 33462100
Study at a glance
From the registry record, last updated by the sponsor on 2 Jan 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Evaluation of the Effect of Daytime Power Napping on Depression, Stress and Sleep According to Working Method: Prospective Cohort Study
- ClinicalTrials.gov ID
- NCT07315269
- Acronym / sponsor ID
- ZTKLAB003102022DSEC23092022237
- Keywords
- Naps, Power napping, Shift workers, Daytime sleep, Mental health, Prospective cohort study
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 40 participants (actual)
- Lead sponsor
- okkes zortukUniversity, hospital or other
- Study start
- 1 Dec 2023 (actual)
- Primary completion
- 1 Jan 2024 (actual)
- Study completion
- 1 Dec 2024 (actual)
- First posted
- 2 Jan 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 prospective cohort study aims to evaluate the effects of daily daytime power napping on sleep quality, depression, and perceived stress levels among healthy individuals. The study particularly investigates whether these effects differ between daytime workers and shift workers. Participants are required to practice a 15-20 minute (maximum 30 minutes) power nap daily for a period of six weeks. Changes in psychological and sleep parameters are assessed using the Jenkins Sleep Scale (JSS), Beck Depression Scale (BDS), and Perceived Stress Scale (PSS) before and after the intervention.
Detailed description
The study was conducted with 40 healthy volunteers (including 29 daytime workers and 11 shift workers) to analyze the impact of daytime napping on mental health and sleep hygiene.
Methodology: At the beginning of the study, participants' demographic information was collected, and baseline assessments were performed using the Jenkins Sleep Scale (JSS) for sleep patterns, the Beck Depression Scale (BDS) for depressive symptoms, and the Perceived Stress Scale (PSS) for stress levels.
Intervention: Participants were instructed to take a short nap (power nap) between 1:00 PM and 3:00 PM for daytime workers, or at suitable intervals for shift workers, every day for 6 weeks. The duration of the nap was strictly limited to 15-30 minutes to avoid sleep inertia.
Evaluation: After the 6-week intervention period, the same scales (JSS, BDS, and PSS) were administered as a post-test. The data were analyzed to compare the pre-test and post-test scores, with a focus on the differences in outcomes between different work schedules (shift vs. daytime). The study adheres to the principles of the Declaration of Helsinki and was approved by the Dicle University Social Sciences and Humanities Ethics Committee.
Study design
- Primary purpose
- Supportive care
- Allocation
- Not applicable
- Intervention model
- Single group
- Masking
- None (open label)
- Number of arms
- 1
| Arm | Type | Receives |
|---|---|---|
| Daytime Power Nap Group | Experimental | Behavioral: Daytime Power NappingA group of 40 participants who are instructed to perform a 15-20 minute power nap daily for 6 weeks. |
Who may qualify
- Ages
- 18 to 65 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (4 listed)
- Being a healthy volunteer.
- Being actively employed as either a daytime worker or a shift worker.
- Providing written informed consent to participate in the study.
- Willingness to adhere to a 6-week daytime power napping protocol.
Key exclusion criteria (4 listed)
- Presence of diagnosed severe sleep disorders (e.g., severe insomnia or sleep apnea) that might interfere with the study protocol.
- Inability to complete the 6-week power napping intervention.
- Missing or incomplete psychological scale data at baseline or post-test.
- Failure to perform the power nap as instructed during the study period.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Daytime Power NappingThe duration, effectiveness, and method of intervention in this area should be clearly stated: Duration Per Session: Each nap is planned to be between 15-20 minutes, and limited to a maximum of 30 minutes to prevent sleepiness (sleep inertia). Total Duration: The intervention is a 6-week process. Target Group: 40 healthy volunteers (including day and shift workers). Goal: To enhance the privacy of sleep in daily life, reduce virus spread, and decrease stress. | Behavioural | Daytime Power Nap Group |
Primary outcome
Change in Sleep Quality as measured by the Jenkins Sleep Scale
Time frame: Baseline (Day 0) and at the end of the 6-week intervention period.
The JSS is a 4-item scale used to assess sleep problems, specifically focusing on difficulties falling asleep and maintaining sleep quality. Each item is scored on a 6-point Likert scale (0-20 total range). Higher scores indicate more sleep problems.
2 secondary outcomes
Change in Depressive Symptoms as measured by the Beck Depression Scale (BDS/BDI)
Time frame: Baseline (Day 0) and at the end of the 6-week intervention period.
Change in Perceived Stress as measured by the Perceived Stress Scale (PSS).
Time frame: Baseline (Day 0) and at the end of the 6-week intervention period.
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 2 Jan 2026.
- Background: PubMed 31955278Brown JP, Martin D, Nagaria Z, Verceles AC, Jobe SL, Wickwire EM. Mental Health Consequences of Shift Work: An Updated Review. Curr Psychiatry Rep. 2020 Jan 18;22(2):7. doi: 10.1007/s11920-020-1131-z.
- Background: PubMed 20699115Faraut B, Boudjeltia KZ, Dyzma M, Rousseau A, David E, Stenuit P, Franck T, Van Antwerpen P, Vanhaeverbeek M, Kerkhofs M. Benefits of napping and an extended duration of recovery sleep on alertness and immune cells after acute sleep restriction. Brain Behav Immun. 2011 Jan;25(1):16-24. doi: 10.1016/j.bbi.2010.08.001. Epub 2010 Aug 8.
- Results publication: PubMed 33462100Juhola J, Arokoski JPA, Ervasti J, Kivimaki M, Vahtera J, Myllyntausta S, Saltychev M. Internal consistency and factor structure of Jenkins Sleep Scale: cross-sectional cohort study among 80 000 adults. BMJ Open. 2021 Jan 18;11(1):e043276. doi: 10.1136/bmjopen-2020-043276.
- Individual participant dataSharing planned: No. To maintain participant confidentiality and comply with the institutional ethics committee's guidelines, individual participant data (IPD) will not be made publicly available. However, metadata and study results are reported within the manuscript.
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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. This study is not recruiting at the moment.
Ökkeş Zortuk principal investigator
Emergency Medicine Department, Defne Government Hospital
Yeşim Dersuneli, MSc study director
Clinical Psychology, Muş Alparslan University
Özlem Tolan, PHd study chair
Clinical Psychology, Dicle University
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Daytime Power Napping in people with Sleep Quality and Depression Disorders, run by okkes zortuk 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 4 inclusion and 4 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: finished, as of the sponsor's last update on 2 Jan 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?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Change in Sleep Quality as measured by the Jenkins Sleep Scale (time frame: Baseline (Day 0) and at the end of the 6-week intervention period.). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT07315269, which also lists 3 linked publications.
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 2 Jan 2026.