Clinical Research Directory

Inclusion Criteria: Age 40 to 75 years. Diagnosis of Chronic Insomnia Disorder according to ICSD-3 criteria. Pittsburgh Sleep Quality Index (PSQI) score ≥5. Insomnia Severity Index (ISI) total score ≥10. Mini-Mental State Examination (MMSE) score \>24. Diagnosis of one of the following prespecified Traditional Chinese Medicine patterns: Heart-Spleen Deficiency; or Liver Qi Stagnation with Spleen Deficiency. TCM pattern diagnosis established according to prespecified standardized diagnostic criteria by a trained TCM practitioner. Participants with hypertension or diabetes may be included if the condition is clinically stable, with no relevant change in medication regimen during the previous 3 months. Able and willing to provide blood and stool samples according to study procedures. Able to understand the study procedures and voluntarily provide written informed consent. Exclusion Criteria Insomnia primarily attributable to another medical, neurological, psychiatric, or sleep disorder requiring alternative management. Current acute or chronic gastrointestinal inflammatory disease, including inflammatory bowel disease, or acute diarrhea. Known Crohn's disease or ulcerative colitis. Use of systemic corticosteroids, antibiotics, probiotics, or prebiotics within 4 weeks before baseline biomarker sampling. Use of proton pump inhibitors within 2 weeks before baseline stool sampling. Regular use of non-steroidal anti-inflammatory drugs. Enema or colonoscopy within 1 month before stool sampling. Active autoimmune or systemic inflammatory disease, including rheumatoid arthritis. Vaccination within 2 weeks before blood sampling. Acute infection or febrile illness at the time of biomarker assessment. Advanced renal, hepatic, or cardiovascular disease, including estimated glomerular filtration rate \<45 mL/min/1.73 m², advanced hepatic failure, or New York Heart Association class III-IV heart failure. Severe nocturia, defined as ≥3 episodes per night. Known obstructive sleep apnea or a high clinical likelihood of obstructive sleep apnea requiring further diagnostic evaluation. Pregnancy or breastfeeding. Any clinical condition considered by the investigators to interfere substantially with sleep assessment, inflammatory biomarker interpretation, treatment safety, or protocol adherence.