 This study aimed to test whether sleep disturbances cause poor health-related quality of life, HRQOL, in adults with rheumatoid arthritis, RA, using mobile health, mHealth, technologies. The results showed that consensus sleep-diary sleep parameters predicted the WHOQOLBREF domain scores, and increased variability in total time asleep was associated with poor physical and psychological domain scores. However, these associations were attenuated when pain, fatigue, and mood were included in the model. The study suggests that optimizing total sleep time, increasing sleep efficiency, decreasing sleep onset latency, and reducing variability in total sleep time could improve HRQOL in people with RA. This article was authored by John Macbeth, William G. Dixon, Susan Mary Moore, and others.