This study will help researchers to understand how cancer and cancer treatments affect sleep patterns. The participants will be recruited from the M. D. Anderson outpatient clinics, including Breast, Neuro-oncology, Blood and Marrow Transplantation, Genitourinary Oncology, Gastrointestinal Oncology Gynecologic Oncology, Head and Heck, Thoracic Oncology, Leukemia, Lymphoma, Melanoma, Sarcoma, Internal Medicine, and the Ambulatory Treatment Center.