Purpose: This study was conducted to determine the effects of an online educational program on nurse practitioner's (NP's) knowledge of identifying and evaluating adults at-risk for obstructive sleep apnea (OSA). Data sources: Knowledge was assessed with a 15 question pre-test and post-test, after a 53 minute narrated PowerPoint educational session. Pre-test and post-test answers were compared to determine the change in knowledge. Fifty-four participants entered the study, and 38 (70.4%) completed. Conclusions: NPs that completed the entire OSA program (n = 38) had a significant improvement in post-test scores as compared to pre-test scores (p < .001, t(37 = -5.024). This was particularly evident (p = .05) in the areas of clinical prevalence, routine health evaluation, signs and symptoms, high risk situations and screening tools. After the educational session, 97.4% of participants indicated they were "very likely" or "likely" to evaluate their patients for OSA. Implications for Practice: NPs have limited formal education on sleep disorders, although are in a key position to make a significant impact on evaluating adults for OSA. Regular screening to identify adults with OSA would likely lead to improving the rate of diagnosis and reducing the associated chronic health problems.