The goal of this clinical trial is to learn if electroacupuncture can improve sleep in people with chronic sciatica caused by lumbar disc herniation. It will also assess the safety of this treatment. The main questions it aims to answer are whether electroacupuncture improves sleep quality and whether it reduces pain and improves daily function. Researchers will compare electroacupuncture to a sham treatment, which looks like real acupuncture but has little or no therapeutic effect, to determine its effectiveness. Participants will be randomly assigned to receive electroacupuncture or sham treatment, will receive treatment three times per week for four weeks, and will complete questionnaires about their sleep, pain, and daily activities.

Inclusion Criteria:

Participants will be eligible if they meet all of the following criteria:

1. Aged 18-75 years, of either sex;
2. Diagnosis with lumbar disc herniation accompanied by unilateral chronic sciatica (disease duration ≥ 3 months);
3. Experiencing moderate to severe radiating leg pain (below the knee), defined as a Numerical Rating Scale (NRS) score ≥ 4 at screening within the past 24 h;
4. Diagnosis of chronic insomnia, with a Pittsburgh Sleep Quality Index (PSQI) total score > 7;
5. Onset or exacerbation of insomnia temporally associated with the onset or worsening of sciatica symptoms;
6. Willing to participate and able to provide written informed consent.

Exclusion Criteria:

Participants will be excluded if any of the following criteria are met:

1. Spinal or structural conditions: lumbar spinal stenosis, spondylolisthesis, vertebral fracture, spinal infection (e.g., tuberculosis), or tumor;
2. Surgical indications: cauda equina syndrome, conus medullaris syndrome, or other conditions requiring urgent surgical intervention;
3. Severe systemic diseases: unstable cardiovascular, hepatic, renal, respiratory, or hematological disorders, or metabolic conditions that may significantly affect study outcomes (e.g., uncontrolled diabetes or thyroid disease);
4. Neurological or psychiatric disorders: major neurological diseases (e.g., epilepsy, Parkinson's disease, dementia, multiple sclerosis) or severe psychiatric disorders (e.g., schizophrenia);
5. Clinically significant depression or anxiety, defined as Patient Health Questionnaire-9 (PHQ-9) ≥ 10 and/or Generalized Anxiety Disorder-7 (GAD-7) ≥ 10;
6. Other primary sleep disorders, including obstructive sleep apnea, narcolepsy, or restless legs syndrome;
7. Use of centrally acting medications: regular use (≥ 3 days/week within 4 weeks prior to enrolment) of medications affecting the central nervous system (e.g., opioids, sedative-hypnotics, antidepressants) without an adequate washout period (≥ 2 weeks or longer depending on drug half-life);
8. Irregular sleep patterns, including night shift work (≥ 2 times/week between 22:00-06:00) or highly irregular sleep-wake cycles;
9. Pregnancy or lactation;
10. History of substance abuse or dependence;
11. Lumbar spine surgery or interventional procedures within the past 3 months;
12. History of acupuncture treatment;
13. Implanted electronic devices (e.g., pacemakers) or metal implants at acupuncture sites;
14. Participation in another clinical trial within the past 3 months;
15. Severe sensory or cognitive impairment affecting assessment compliance;
16. Any other condition deemed by investigators to compromise safety or data integrity.