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Previous studies have reported well-documented findings that mobile phone addiction (MPA) is associated with negative emotion-related consequences; however, sporadic research has investigated the associations between MPA and cognitive outcomes related to daily cognitive functioning. Sleep duration, sleep quality, and trait self-regulation are thought to be linked to this association. The present study aimed to examine the mediating roles of sleep duration and quality and the moderating role of trait self-regulation between MPA and daily cognitive failures. A total of 1721 secondary school students were recruited to complete four self-reported questionnaires. The model results indicated that sleep quality (but not sleep duration) partially mediated the association between MPA and daily cognitive failures, and high levels of trait self-regulation could attenuate the potential impact of MPA on daily cognitive failures …