Objective:

To examine the effectiveness and active components of digital health interventions (DHIs) for promoting healthy sleep in adolescents, highlighting the critical need to address sleep issues in this population.

Key Findings:

• dCBT-I significantly reduced insomnia severity (SMD = −3.32) and modestly improved sleep quality (SMD = −0.32), with statistical significance noted.
• Secondary benefits for mental health outcomes were observed with dCBT-I.
• Active components of DHIs included cognitive restructuring, mindfulness, stimulus control, and sleep restriction.
• Most DHIs were unguided (55.5%) or provided minimal online support (33.3%).
• Educational and lifestyle interventions yielded mixed effects.

Interpretation:

dCBT-I is particularly beneficial for adolescents experiencing insomnia or poor sleep, suggesting a need for refined digital delivery and intervention fidelity in future research, with implications for clinical practice.

Limitations:

• Variability in the quality and design of included studies.
• Limited guidance and support in many DHIs may affect efficacy, along with potential biases in the studies reviewed.

Conclusion:

Future research should clarify which active ingredients in DHIs drive sustained improvements in sleep and mental health among adolescents, emphasizing the importance of addressing sleep health.