ObjectiveThis study examined whether mindfulness increased through participation in movement based courses and whether changes in self-regulatory self-efficacy, mood, and perceived stress mediated the relationship between increased mindfulness and better sleep. Participants 166 college students enrolled in the 2007-2008 academic year in 15 week classes in Pilates, Taiji quan, or GYROKINESIS®. Methods At beginning, middle, and end of the semester, participants completed measures of mindfulness, self-regulatory self-efficacy, mood, perceived stress and sleep quality. Results Total mindfulness scores and mindfulness subscales increased overall. Greater changes in mindfulness were directly related to better sleep quality at the end of the semester after adjusting for sleep disturbance at the beginning. Tired Mood, Negative Arousal, Relaxed Mood, and Perceived Stress mediated the effect of increased mindfulness on improved sleep. Conclusions Movement based courses can increase mindfulness. Increased mindfulness accounts for changes in mood and perceived stress that explain, in part, improved sleep quality.