The present study investigated the relations among decision-making difficulties, maladaptive limitedness schemas, sleep quality, and circadian preferences in a sample of 311 Turkish college students. As expected, the associations between career decision-making difficulties, as measured by the Career Decision-Making Difficulties Questionnaire (CDDQ), and poor sleep quality were significant, but the connections were small. Pearson correlations of poor sleep quality with career decision-making difficulties, including Lack of Information and Difficulties related to Inconsistent Information sub-scales, and CDDQ total scores, ranged from 0.19 to 0.20. On the other hand, in the multiple regression analyses we found that dysfunctional thinking, as measured by the Limitedness Schemas Questionnaire (LSQ), significantly contributed to all three sub-scales and total scores of the CDDQ. Implications of these findings are discussed.