AUTHOR=Liu Chengyong , Wang Chi , Jiang Jing , Bo Yuyang , Nan Lixiu , Zhang Ying , Zhu Kongxi , Wang Xiaoqiu , Feng Xinxin , Lian Xiaoyang , Qin Shan TITLE=Role of metabolic characteristics in the co-occurrence of insomnia, Alzheimer’s disease, and Parkinson’s disease: a Mendelian randomization study JOURNAL=Frontiers in Aging Neuroscience VOLUME=16 YEAR=2025 URL=https://www.frontiersin.org/journals/aging-neuroscience/articles/10.3389/fnagi.2024.1436171 DOI=10.3389/fnagi.2024.1436171 ISSN=1663-4365