摘要
Summary What is already known about this topic?Earlier studies indicated that shorter or excessive sleep duration at baseline was related to cognitive impairment.Yet few studies have been concerned with the association between sleep duration changes and cognitive performance,especially in low-and middleincome countries.What is added by this report?A prospective cohort study suggests that maintaining moderate sleep duration may lead to optimal cognitive performance.Either decreasing,increasing,or keeping a longer sleep duration is associated with the risk of cognitive impairment among Chinese elderly aged 65 years and over.
基金
Supported by grant from National Key Research and Development Program of China(No.2018YFC2000603)
National Natural Science Foundation of China(41871360).
