If you choose to take part in this study, you will come to M. D. Anderson for your first visit. If this is not convenient, a researcher can visit you at your home. At this time, you will be asked to complete several questionnaires. The questions will ask about your sleeping habits, how you have been feeling, and your general QOL. This will take about 45-60 minutes to complete. Researchers, will then ask you to complete a daily sleep diary for the next 7 days. During this time, you will be given an actigraph watch to wear that will collect data about your day-time activity and sleeping habits. The watch should be worn 24 hours a day for 7 days a week. You will have an electrocardiogram (ECG - a test to measure the electrical activity of your heart) and your breathing rate will be measured.