Aim: The purpose of this study was to investigate the attachment styles of people with opioid abuse disorders and their relationship with mindfulness and sleep quality.

Materials and Methods: In this study, 120 male opioid males, who were sampled by accessible method, responded to the scale of attachment, mindfulness and sleep quality styles. After determining the frequency of each attachment styles, the relationship between the level of mindfulness and the quality of sleep was determined in people with different attachment styles. Statistical analysis was performed using one-way ANOVA. In case of observing a significant difference the post hoc Tukey test was used.

Results: Mindfulness level in subjects with safe attachment was higher than those with anxiety and ambivalent attachment (p=0.03). No significant difference was found between the level of anxiety and insecure attachment and ambivalent attachment (p>0.05). The lowest mean score of sleep quality was for those with safe attachment style, then ambivalent and, lastly, avoidance. There was no significant difference in the level of sleep quality among people with different attachment patterns (p>0.05).

Conclusion: Individuals with safe attachment style have higher scores, and those with ambivalent attachment style have lower scores. Sleep quality is not affected by mindfulness.