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HD-tDCS over the dorsal medial prefrontal cortex reduces insomnia severity and improves sleep onset latency and sleep efficiency in chronic insomnia patients

A 10-day regimen of active high-definition transcranial direct current stimulation (HD-tDCS) targeting the bilateral dorsal medial prefrontal cortex significantly decreased Pittsburgh Sleep Quality Index (PSQI) scores compared to sham stimulation in chronic insomnia patients. Exploratory polysomnography findings also showed improvements in sleep onset latency and sleep efficiency after active treatment.

Last updated: Jul 7, 2026•1 RCTs•📖 Read as article →

Evidence Score

Evidence Score42/100
Human RCT★★☆☆☆
Meta-analysis☆☆☆☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. Effects of high-definition transcranial direct current stimulation for the treatment of chronic insomnia: a randomized, double-blind, controlled trial.

observational

Li J, Li A, Jiao J, Hu K, Jiang Y, Hu X, Wang K, Chen X, Xie C · Scientific reports (2025)

Participants: N/A
Duration: 10 days
Intervention: 10 days of active anode HD-tDCS over the DMPFC (anode at Fz, cathodes at FPz, F3, Cz, F4)
Outcome: Pittsburgh Sleep Quality Index (PSQI) score, sleep onset latency (SOL), sleep efficiency (SE), sleep stage ratio
Effect Size: N/A
Population: 55 patients with chronic insomnia

Result:

PubMed: 40695876DOI: 10.1038/s41598-025-09304-4

Mechanism Graph

Anodal HD-tDCS applied over DMPFC modulates cortical excitability in prefrontal regions
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Enhanced prefrontal control over arousal and sleep-regulating circuits
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Reduction in hyperarousal and maladaptive sleep-related cognition
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Result: Improved sleep initiation and maintenance, reduced insomnia severity

Limitations

  • ⚠Small sample size (n=55) limits generalizability
  • ⚠No long-term follow-up data reported
  • ⚠Exploratory nature of PSG findings without correction for multiple comparisons

Frequently Asked Questions

What is HD-tDCS and how does it differ from conventional tDCS?▼

HD-tDCS uses a high-definition array of small electrodes (e.g., one anode and four cathodes) to more focally target brain regions, such as the DMPFC, compared to conventional tDCS which uses larger sponge electrodes.

How long does it take for HD-tDCS to improve insomnia symptoms?▼

In this study, improvements were observed after 10 daily sessions of stimulation, with PSQI scores decreasing and sleep onset latency and efficiency improving post-treatment.

Is HD-tDCS safe for chronic insomnia patients?▼

The study reports no adverse effects, but the authors note that additional safety data are needed before it can be recommended as a routine therapy.

Can HD-tDCS replace medication or cognitive behavioral therapy for insomnia?▼

The authors suggest HD-tDCS is a possibly promising supplement to medication and CBT-I, not a replacement, and requires replication.

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References

  1. 1.Li J, Li A, Jiao J, Hu K, Jiang Y, Hu X, Wang K, Chen X, Xie C. "Effects of high-definition transcranial direct current stimulation for the treatment of chronic insomnia: a randomized, double-blind, controlled trial.." Scientific reports, 2025. PMID: 40695876 DOI: 10.1038/s41598-025-09304-4
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.