There is currently a lack of clinical research that would strongly support the application of CBT in the treatment of narcolepsy type 1. Despite that, there are several guidelines that suggest some techniques should be routinely applied. Currently, there is still a lack of results on what to do with patients who have comorbid sleep and psychiatric disorders or other psychosocial comorbidities and problems. This case study concerns a 27-year-old female who had narcolepsy type 1 and history of sleep, psychosocial, and psychiatric problems. Her main problems included cataplexy, daily tiredness and sleepiness, a problem with daily physical activity, and problems in her psychosocial functioning. The patient received 7 session of CBT treatment based on recommended techniques for patients with hypersomnia. Self-reported measure of sleep, anxiety, and depression were collected at the start and 1-month post-treatment. Objective psychological measures recorded positive changes in post-treatment assessment of CBT effect on her sleep pattern, significant reduction of cataplexy, depressive and anxiety symptoms, daily activity, and tiredness during the day.