Scientific discussions about false memories have, so far, mainly focused on external determinants (e.g., therapeutic interventions). However, in some cases, false memories might develop more spontaneously. For example, difficulties in distinguishing between dreams and reality may lead to false memories. The present article discusses two studies (N = 85 and 255, respectively) that examined to what extent such difficulties occur. In both studies, a nontrivial minority of respondents (11.8% and 25.9%, respectively) reported that they had had the experience of not being able to discriminate between dream and reality. As expected, respondents who reported this type of confusion scored higher on fantasy proneness and dissociation measures than respondents who did not report this confusion.