ABDUL KALIB, Z.I. et al. 2026. A Parsimonious and Authentically Validated Feature Subgroup for Questionnaire-Based Insomnia Classification: A Multi-Method Reduction Benchmarked Across Machine Learning and Deep Learning Models. International Journal of Advanced Communication Technology (IJACT). 5, (Jul. 2026). DOI:https://doi.org/10.58915/ijact.v5.2026.3316.