1. World Health Organization. World health statistics 2022: monitoring health for the SDGs, sustainable development goals. Available from: www.who.int/. Accessed July 5, 2023.
2. United Nations. World population prospects; 2022. Available from: https://population.un.org/. Accessed July 5, 2023.
3. National Bureau of Statistics of China. Demographic bulletin; 2022. Available from: www.stats.gov.cn/. Accessed July 5, 2023.
4. Secular trends in adult sleep duration: A systematic review
5. Trends in prevalence of short sleep duration and trouble sleeping among US adults, 2005–2018