Background <p>As the second most prevalent cancer-related symptom, insomnia has a long-lasting detrimental effect on cancer patients’ and survivors’ quality of life. This study is intended to examine the current research status and emerging hotspots of cancer-related insomnia from January 1, 2015, to March 25, 2025, to provide a valuable reference for future investigations.</p> Methods <p>Literature related to cancer-associated insomnia was retrieved from the Web of Science Core Collection and visually analyzed using CiteSpace, VOSviewer, and Scimago Graphica.</p> Results <p>A total of 732 articles were retrieved. Research on cancer-related insomnia has exhibited a generally upward trend. Among these, the United States ranks first in publication volume, while Laval University in Canada is identified as the most productive institution. The <i>Journal of Clinical Oncology</i> is the most frequently cited, whereas <i>Supportive Care in Cancer</i> has the highest number of published articles. Garland, Sheila N was the most published author, while Mao, Jun J had the highest average number of citations in publications. The current research hotspots have been identified as insomnia in breast and lung cancer, quality of life among patients with cancer-related insomnia, and therapeutic approaches to its management. Future investigations are anticipated to emphasize the screening and assessment of insomnia in oncology populations, along with broader issues in supportive care.</p> Conclusion <p>Insomnia has increasingly been recognized for its detrimental impact on treatment efficacy and overall quality of life among individuals diagnosed with cancer and those in post-treatment survivorship. This study presents an in-depth bibliometric analysis of cancer-related insomnia literature published between 2015 and 2025, serving as a foundational reference for subsequent investigations.</p>