An interventional study of Charge Your Brainzzz in Intervention Effectiveness and Implementation Research, sponsored by VU University of Amsterdam. Active, not recruiting at 1 site in Netherlands. Per ClinicalTrials.gov, last updated 2026-01-28.
Sponsored by VU University of Amsterdam · Not applicable, Interventional, and Prevention
Poor sleep among teenagers is a major public health issue. Studies show that in the Netherlands, nearly half of adolescents don't wake up feeling rested, one in five feel sleepy during the day, one in four regularly wake up at night, 65% rate their own sleep quality as poor, and 43% sleep less than the recommended 8-10 hours per night. Over the past decade, teenagers' average sleep time has dropped by about 40 minutes.
Good sleep health means having a regular sleep rhythm with about 8-10 hours of quality sleep each night. This is crucial, because poor sleep in teenagers can lead to problems with thinking, learning, concentration, and school performance. In the long run, it also increases the risk of serious health issues such as anxiety, depression, obesity, diabetes, cardiovascular disease, and even dementia.
Because of these risks, schools, municipalities, and public health services are calling for effective ways to prevent sleep problems among teenagers. The Dutch "Healthy School" program has recently added sleep as a core theme, but proven, practical interventions are still lacking.
To address this gap, the Charge Your Brainzzz (CYB) program was developed. CYB is a comprehensive approach designed to help secondary school students improve their sleep and mental well-being. It is based on the Healthy School framework and includes all four pillars: education, environment, policy, and early detection.
In 2024, a pilot study tested the CYB approach for its initial effectiveness and suitability. Early results showed positive changes in sleep outcomes and strong appreciation from both schools and students. However, before CYB can be rolled out nationwide, more evidence is needed on its effectiveness, fit with schools, and how it can be sustained over time.
That's why this project will conduct a large-scale evaluation of both the impact of CYB and the processes needed for successful implementation. Alongside the effectiveness study, a practical roadmap will be co-created with schools, Healthy School Advisors, and local coordinators to ensure that CYB can be optimally implemented, sustained, and scaled up across schools, municipalities, and public health services across the Dutch public health landscape.
Poor sleep health among adolescents is a major public health problem. In the Netherlands, nearly half of adolescents report not waking up feeling rested, one in five say they feel sleepy during the day, one in four regularly do not sleep through the night, 65% rate their own sleep quality as poor, and 43% sleep less than the recommended 8-10 hours per night. Over the past ten years, adolescents' average sleep duration has decreased by about 40 minutes.
Sleep health refers to maintaining a regular sleep rhythm of approximately 8-10 hours of good-quality sleep per night. Sleep health is extremely important, because when teenagers sleep poorly, they may experience declines in cognition, learning ability, concentration, and school performance. Moreover, poor sleep in adolescence increases the risk of long-term health problems such as anxiety and depression, obesity, diabetes, cardiovascular disease, and dementia.
From both research and the practical experience of schools, municipalities, and public health services, there is a strong demand for effective interventions to address these problems through prevention among teenagers. The Dutch "Healthy School" program (Gezonde School) shares this sense of urgency and has recently added sleep as a core theme. However, proven effective interventions for practice are still lacking.
To fill this gap, the integrated Charge Your Brainzzz (CYB) approach was recently developed to support secondary school students in improving their sleep and mental well-being. The approach is based on the Healthy School framework, with well-substantiated applications of all four Healthy School pillars: Education, Environment, Policy, and Early Detection.
In 2024, a pilot study was conducted to evaluate the initial effectiveness and suitability of the CYB approach (Pilot Study results in draft, 2025). Preliminary results from this pilot evaluation showed positive changes in sleep outcomes and strong appreciation from both schools and adolescents. However, before schools, municipalities, and public health services can implement CYB nationwide within the Healthy School framework, it is important to establish clarity about the program's effectiveness, appropriateness, sustainability processes, and, above all, its efficacy. Therefore, a sufficiently large, controlled evaluation study is needed to assess both effectiveness in practice and the processes of implementation and sustainability.
This project will therefore evaluate both the effectiveness as well as the implementation and sustainability processes of the CYB approach. In parallel, a step-by-step plan will be co-created with schools, Healthy School Advisors, and local JOGG coordinators to enable them to implement, sustain, and scale up the CYB approach across schools, municipalities, and public health services.
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Behavioral: Charge Your Brainzzz
Charge Your Brainzzz is a comprehensive health promoting school approach intervention, designed to help Dutch secondary school students improve their sleep and sleep hygiene habits. It is based on the Health Promoting School framework and includes all its four pillars, i.e. (1) an education component, (2) a set of components that focus on involving students' (home) environment, a set of school policy changes related to school start times, schools' digital communication activities and schools' stimulation of daytime physical activity of students, and, lastly, (4) a set of tools that school health professionals can use to facilitate the early detection of potential (future) student sleep problems.
Subjective sleep health
Subjective sleep health will be assessed using a concise questionnaire that comprehensively covers the submeasures (1) sleep duration, (2) sleep quality, (3) sleep efficiency, (4) bedtime routines/sleep hygiene, (5) sleep timing, and (6) daytime sleepiness \[1,2\]. In addition to sleep health, the most relevant behavioral determinants will be measured at each assessment point, alongside the direct targets of the CYB program. These include, for example, the presence of household rules regarding bedtimes and wake-up times, as well as adolescents' sleep hygiene practices, with particular attention to evening screen use and the presence of a mobile phone in the bedroom at night. Time frame of data collection: prior to implementation of the program (T0), within two weeks after completion of the educational component, (T1), and at six-month follow-up after T1 (T2). 1. Buysse (2014). https://doi.org/10.5665/sleep.3298 2. Meltzer (2021). https://doi.org/10.1016/j.smrv.2021.101425
Time frame: From the start of the intervention until 6 months after its completion
Objective sleep duration
A random selection of approximately two classes per participating school will wear GeneActiv sleep monitors during the three measurement periods (T0, T1, T2) to objectively assess sleep duration and sleep quality. These sleep monitors will be worn continuously on the wrist for a period of five weekdays. These devices measure the activity pattern, temperature, and ambient light surrounding the student wearing them.
Time frame: During five weekdays directly prior to the start of the intervention's implementation, within two weeks after its completion, and six months thereafter.
Objective sleep quality
A random selection of approximately two classes per participating school will wear GeneActiv sleep monitors during the three measurement periods (T0, T1, T2) to objectively assess sleep duration and sleep quality. These sleep monitors will be worn continuously on the wrist for a period of five weekdays. These devices measure the activity pattern, temperature, and ambient light surrounding the student wearing them. Additionally, during these days, students will complete a sleep diary each morning (approximately 5 minutes).
Time frame: During five weekdays directly prior to the start of the intervention's implementation, within two weeks after its completion, and six months thereafter.
Subjective Sleep Duration
All participating students will complete a sleep diary each morning (approximately 5 minutes) in which they report their sleep duration.
Time frame: During five weekdays directly prior to the start of the intervention's implementation, within two weeks after its completion, and six months thereafter.
Students' knowledge on healthy sleep
An assessment of students' knowledge on healthy sleep, based on the content of what's being taught via the CYB intervention program
Time frame: Prior to intervention implementation (T0), within two weeks after intervention completion (T1), and six months after T1.
Students' attitude towards sleep health
An assessment of students' attitude towards healthy sleep and their awareness of its importance to their health, wellbeing and ability to learn, based on the content of what's being taught via the CYB intervention program
Time frame: Prior to intervention implementation (T0), within two weeks after intervention completion (T1), and six months after T1.
Students' self-efficacy in relation to their sleep health
An assessment of students' self-efficacy/skills in relation to regulating their healthy sleep habits, based on the content of what's being taught via the CYB intervention program
Time frame: Prior to intervention implementation (T0), within two weeks after intervention completion (T1), and six months after T1.
Students' subjective norms in relation to sleep health of their peers and parents
An assessment of the subjective norm that students experience in their social environment in relation to healthy sleep habits.
Time frame: Prior to intervention implementation (T0), within two weeks after intervention completion (T1), and six months after T1.
Students' behavioral intention to sleep healthier
An assessment of whether students have the intention to exhibit healthier sleep habitss as a consequence of their school participating in the CYB intervention program
Time frame: Prior to intervention implementation (T0), within two weeks after intervention completion (T1), and six months after T1.
Students' sleep hygiene practices
An assessment of students' pre-sleep habits, or sleep hygiene practices, based on the content of what's being taught via the CYB intervention program
Time frame: Prior to intervention implementation (T0), within two weeks after intervention completion (T1), and six months after T1.
Appreciation and acceptance of the intervention
In the first school year following the start of the implementation of the program (T1), and again six months later (T2), semi-structured interviews will be conducted with implementers of the CYB approach, i.e., the various school professionals involved, in order to monitor and evaluate the implementation within the school setting
Time frame: In the first school year following the start of the implementation of the program (T1), and again six months later (T2)
Facilitators and barriers in relation to the intervention's adoption, implementation and sustainment
An assessment of the facilitators and barriers in relation to the adoption, implementation and sustainment processes of the CYB program
Time frame: In the first school year following the start of the implementation of the program (T1), and again six months later (T2)
Ripple effects mapping
The broader impact of the CYB program will be evaluated using the innovative systems-based evaluation method Ripple Effects Mapping (REM). Through this approach, we will work with implementers of the CYB program to capture, in real time, the overall impact of CYB. Ripple Effects Mapping provides an overview of both the direct and indirect effects of the various program components. These may occur within schools, within municipalities, at the level of the CYB program owner, or in other ways in which the intervention may have had unforeseen impact. REM sessions will commence once the CYB program has been expanded with activities beyond the school setting and will subsequently take place approximately every four months. During these sessions, time will be devoted to reviewing the actions and changes that have occurred in the past four months (retrospective analysis) as well as those that are expected or planned for the coming four months.
Time frame: Every 4 months after the start of the intervention's implementation
Plan to share: No
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