This chapter includes a case on narcolepsy as experienced by a college-aged female. Narcolepsy is a chronic neurological disorder that affects the brain’s ability to control sleep–wake cycles. The client in this case felt rested after waking, but then feel very sleepy throughout much of the day.

Narcolepsy greatly affected the daily activities and may impact the future of the client who had hoped to be a typical college student. Questions for consideration follow the case study.

Dissociative identity disorder (DID) is usually a reaction to trauma as a way to help a person avoid bad memories and is characterized by the presence of two or more distinct personality identities. This chapter highlights the detailed case of an adult woman diagnosed with DID. The case offers an in-depth description of the client’s identities and takes the reader on a journey through her treatment. Questions for consideration are also included.

For a sexual problem to be considered a sexual dysfunction, the symptoms must be present for at least 6 months, cause significant distress, and cannot be caused exclusively by a nonsexual mental disorder (e.g., substance use, depression), significant relationship distress, medical illness, or medication. The three cases in this chapter represent various sexual dysfunctions, such as female sexual interest/arousal disorder and erectile dysfunction disorder, and their respective treatment. Questions for consideration follow each case.

Gender dysphoria is the feeling of discomfort or distress that might occur in people whose gender identity differs from their sex assigned at birth or sex-related physical characteristics. The cases in this chapter include two cases of adolescent gender dysphoria. In the first case, the adolescent is considering future transition against the backdrop of family acceptance and cultural issues while the other adolescent highlighted in this chapter has transitioned and manages depression and a history of child abuse. Questions for consideration follow each case.