IFNG and insomnia: Ultimately, through multimodal correlation analysis, the ‘Interferon-γ (IFN-γ)-WM aberrance-insomnia’ axis was discovered in the MMT group.<h4>Conclusions</h4>Together, these results primarily link cytokines and WM injury for OUDs with MMT to insomnia, implicating pharmacological IFN-γ target as a latent strategy to improve the insomnia of MMT patients.