Efficacy and Autonomic Mechanisms of Transcutaneous Auricular Vagus Nerve Stimulation in Improving Post-Stroke Insomnia

INTERVENTION: taVNS group:Transcutaneous Auricular Vagus Nerve Stimulation (taVNS);Sham group:Sham Stimulation; CONDITION: Post‐stroke Insomnia (PSI) PRIMARY OUTCOME: Pittsburgh Sleep Quality Index; SECONDARY OUTCOME: Hamilton Depression Scale‐17;HRV value(s);Hamilton Anxiety Scale;Insomnia Severity Index;National Institutes of Health Stroke Scale; INCLUSION CRITERIA: 1. Meet the diagnostic criteria for stroke and insomnia as defined in this study; 2. Aged 18‐75 years, regardless of sex; 3. Pittsburgh Sleep Quality Inde X(PSQI) score >= 8; 4. At least 2 weeks after stroke onset, with clear consciousness and the ability to complete study assessments and interventions; 5. Willing to participate in the study and provide written informed consent.