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Sleep quality mediates the relationship between mental health and functional outcomes in early adolescence

Sleep quality mediated 18.5%, 36.3%, and 8.3% of the relationships between depression, anxiety, and psychotic-like experience distress with academic functioning, respectively, and 19.6-23.3% of the relationships with social problems. Screen time was the second strongest mediator, but only sleep quality showed >3% mediation for social problems.

Last updated: Jul 10, 2026•0 RCTs•📖 Read as article →

Evidence Score

Evidence Score32/100
Human RCT☆☆☆☆☆
Meta-analysis☆☆☆☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. Mediating effects of healthy lifestyle factors on associations between mental health and functional outcomes in early adolescence.

observational

Smucny J, Lesh TA, Niendam TA, Karcher NR · Psychological medicine (2026)

Participants: N/A
Duration: 2-3 years
Intervention: Observational assessment of lifestyle factors (sleep quality, screen time, physical activity, Mediterranean diet) as mediators
Outcome: Academic functioning and social problems measured 2-3 years later
Effect Size: N/A
Population: Early adolescents (ages 10-13) from the Adolescent Brain Cognitive Development Study

Result:

PubMed: 42410880DOI: 10.1017/S0033291726105121

Mechanism Graph

Mental health issues (depression, anxiety, psychotic-like experiences) are associated with poor sleep quality
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Poor sleep quality impairs cognitive and social functioning
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This leads to worse academic and social outcomes
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Result: Sleep quality partially explains the link between mental health and functional outcomes

Limitations

  • ⚠Observational design cannot establish causality
  • ⚠Mediation effects were modest and varied by environmental risk factors

Frequently Asked Questions

What lifestyle factor was the strongest mediator between mental health and academic functioning?▼

Sleep quality was the strongest mediator, accounting for 8.3% to 36.3% of the relationship depending on the mental health condition.

Did financial adversity affect the mediating role of sleep quality?▼

Yes, mediating effects of sleep quality on academic functioning decreased as financial adversity increased.

Which mental health condition showed the largest mediation by sleep quality for academic functioning?▼

Anxiety showed the largest mediation, with sleep quality explaining 36.3% of the relationship.

Was screen time a significant mediator for social problems?▼

No, only sleep quality showed >3% mediation for social problems (19.6-23.3%).

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References

  1. 1.Smucny J, Lesh TA, Niendam TA, Karcher NR. "Mediating effects of healthy lifestyle factors on associations between mental health and functional outcomes in early adolescence.." Psychological medicine, 2026. PMID: 42410880 DOI: 10.1017/S0033291726105121
Disclaimer: This content is for educational purposes only and is not medical advice. Evidence scores reflect the quality and quantity of available research, not clinical recommendations. Always consult a healthcare professional before starting any supplement or intervention.