Dr. Xiaoyu Li is a social epidemiologist at Tsinghua University. Her research has focused on examining contextual (social and environmental) and behavioral determinants of sleep insufficiency and sleep disorders, as well as downstream health outcomes across the lifespan. She did her doctoral training in social epidemiology at Harvard T.H. Chan School of Public Health and her postdoctoral training in sleep epidemiology at Harvard T.H. Chan School of Public Health and Brigham and Women's Hospital.