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Transcranial direct current stimulation improves sleep quality and enhances offline consolidation of implicit sequence learning in individuals with insomnia

A randomized, double-blind, controlled trial assigned 42 individuals with insomnia to either active tDCS or sham stimulation for 7 consecutive days. The active stimulation group showed significantly lower PSQI scores and greater offline consolidation effects compared to sham, with significant Group x Time interactions for both sleep quality (F(1,40)=31.375, p<0.001, ηp2=0.440) and offline consolidation (F(1,40)=7.913, p=0.008, ηp2=0.165).

Last updated: Aug 4, 2026•1 RCTs•📖 Read as article →

Evidence Score

Evidence Score44/100
Human RCT★★☆☆☆
Meta-analysis☆☆☆☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. Transcranial direct current stimulation enhances offline consolidation of implicit sequential learning in individuals with insomnia.

observational

He L, Ma Z, Wu Z, Wang D, Ding X · Journal of psychiatric research (2026)

Participants: N/A
Duration: 7 days
Intervention: Transcranial direct current stimulation (tDCS) applied for 7 consecutive days (active vs. sham)
Outcome: Sleep quality (PSQI score) and offline consolidation of implicit sequence learning
Effect Size: ηp2=0.440 for sleep quality, ηp2=0.165 for offline consolidation
Population: Individuals with insomnia (n=42, active group n=21, sham group n=21)

Result:

PubMed: 42537590DOI: 10.1016/j.jpsychires.2026.07.025

Mechanism Graph

tDCS modulates cortical excitability in brain regions involved in sleep regulation and memory consolidation
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Enhanced synaptic plasticity during stimulation may facilitate offline consolidation of implicit sequence learning
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Improved sleep quality may further support memory consolidation processes
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Result: Active tDCS group showed significant improvements in both sleep quality and offline consolidation compared to sham

Limitations

  • ⚠Abstract does not report tDCS parameters (e.g., current intensity, electrode placement, duration per session)
  • ⚠No follow-up assessment to determine long-term durability of effects
  • ⚠Sample size is relatively small (n=42), limiting generalizability

Frequently Asked Questions

What is transcranial direct current stimulation (tDCS)?▼

tDCS is a non-invasive brain stimulation technique that applies a weak electrical current to the scalp to modulate neuronal activity, potentially enhancing cognitive functions and sleep.

How does tDCS affect implicit sequence learning in insomnia?▼

In this study, 7 days of active tDCS significantly improved offline consolidation of implicit sequence learning compared to sham, suggesting enhanced memory consolidation during sleep or rest.

Does tDCS improve sleep quality in insomnia?▼

Yes, the active tDCS group showed significantly lower PSQI scores after the intervention, indicating improved sleep quality compared to the sham group.

What is the recommended tDCS protocol for insomnia?▼

The abstract does not specify the exact tDCS parameters (e.g., current intensity, electrode placement, session duration), so no specific protocol can be recommended based on this study alone.

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References

  1. 1.He L, Ma Z, Wu Z, Wang D, Ding X. "Transcranial direct current stimulation enhances offline consolidation of implicit sequential learning in individuals with insomnia.." Journal of psychiatric research, 2026. PMID: 42537590 DOI: 10.1016/j.jpsychires.2026.07.025
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.