The central regulatory effects of acupuncture in treating primary insomnia: a review - Yao, Lin; Liu, Yanze; Li, Mengyuan; Zheng, Haizhu; Sun, Mengmeng; He, Min; Zhong, Zhen; Ma, Shiqi; Huang, Haipeng; Wang, Hongfeng (Frontiers in Neurology, 2024)