Abstract: Objective To analyze the association between insufficient sleep at different time periods and overweight/obesity among children and adolescents in Guangdong Province,and to provide scientific basis for the prevention and control of overweight and obesity. Methods A multi‐stage stratified random sampling method was used to select children and adolescents aged 6-17 years from 13 cities and counties in Guangdong Province for questionnaire survey and physical measurement. logistic regression was used to analyze the association between insufficient sleep at different time periods and overweight/obesity among children and adolescents. Results A total of 431 cases of overweight/obesity were detected among 3 575 children and adolescents,with a prevalence rate of 12.06% （among which 6.80% were overweight and 5.26% were obesity）. The reported rates of insufficient sleep were 47.50%,54.41% and 24.17%,respectively,on weekdays,school days and weekends. logistic regression analysis showed that insufficient sleep during both school days and weekends was associated with overweight and obesity in children and adolescents（OR=1.45）. Stratified analysis found that girls （OR=1.63）,primary school students （OR=1.53）,and rural students （OR=2.52） were at increased risk of overweight and obesity when they had insufficient sleep during both school days and weekends. Conclusions Insufficient sleep is common among children and adolescents in Guangdong Province. More attention should be paid to girls,primary school students,and rural students,and ensuring sufficient sleep time during both school days and weekends can help reduce the occurrence of overweight and obesity.

Key words: Sleep duration, Insufficient sleep, Overweight, Obesity, Children, Adolescent