Abstract: With the rapid growth of Chinese economic, the widening income gap and its detrimental effects on adolescents’ development has received substantial attention. A large body research has documented the negative association between low family income and adolescent adjustment. The present study aimed to examine the relationship between low family income and adolescents’ sleep quality. Sleep is especially important during adolescent. There is considerable evidence suggesting that sleep is a powerful predictor of adolescents’ mental, physical, and psychological consequences. However, the adolescents from low income family are at increased risk of low sleep quality, insufficient sleep, and low sleep efficiency. To our knowledge, most research has focused the negative association between low family income and adolescents’ sleep quality, however little is known about the mediating mechanisms (i.e., how does low family income relate to adolescents’ sleep?) underlying this relation. Determining the roles of mediators in the relationship between low family income and adolescents’ sleep would be important to provide guidance for interventions to improving sleep quality. Thus, the purposes of the present study were to examine the relationship between family income and adolescents’ sleep quality as well as the chain mediating effect of perceived discrimination and self-esteem in the relationship between family income and adolescents’ sleep quality. A sample of 1053 adolescents (mean age = 14.95 years, SD = 1.66) in Guangdong Province was recruited to participate in this study. Participants anonymously completed the questionnaire of family income, perceived discrimination, Self-Esteem Scale (SES), and Pittsburgh Sleep Quality Index (PSQI). We first calculated descriptive statistics for our variables of interest, followed by bivariate associations among these variables in SPSS 21.0 software, and follow-up structural equation modeling (SEM) was conducted using Mplus 7.0. The total PSQI score of 8 was used as cutoff and the prevalence of poor sleep was 15.60%. The correlations among family income, perceived discrimination, self-esteem, and sleep quality were all significant. In addition, structural equation modeling showed that perceived discrimination and self-esteem played the chain mediating effect in the relationship between family income and sleep quality. In conclusion, family income not only has a direct effect on adolescents’ sleep quality but also influences sleep quality by the chain mediating effect of perceived discrimination and self-esteem. These findings contribute to understanding mechanisms underlying the relationship between low family income and adolescents’ sleep quality and have important implications for interventions aimed at improving adolescents’ sleep quality.

Key words: family income, perceived discrimination, self-esteem, sleep quality, adolescents, chain mediation

摘要： 本研究探讨家庭收入与青少年睡眠质量的关系以及歧视知觉、自尊在其中的中介作用。采用家庭收入问卷、歧视知觉问卷、Rosenberg自尊量表（SES）与匹兹堡睡眠质量指数量表（PSQI）对广东省某地区三所中学1053名青少年进行匿名施测。结果发现：（1）以PSQI得分 ≥ 8作为睡眠问题的参考界值，青少年睡眠问题的检出率为15.60%；（2）歧视知觉、自尊在家庭收入与青少年睡眠质量关系中起链式中介作用。因此，家庭收入既直接影响青少年的睡眠质量，又通过歧视知觉、自尊的链式中介作用影响青少年的睡眠质量。

关键词: 家庭收入, 歧视知觉, 自尊 , 睡眠质量 , 青少年, 链式中介