One week, 3 months, 6 months, and 12 months after the end of the yoga or stretching sessions (or similar time for the usual care group), you will be asked to return to the clinic. You will fill out a packet of questionnaires and complete an ECG evaluation again. The questionnaires and tests should take about 60 minutes to complete. You will also be asked to wear the actigraph and complete daily sleep diary forms for another 7 days. At the end of the 7 days, you will return the actigraph and sleep diaries to the research staff, or a member of the research staff can go to your home to pick them up. This will be your last participation in the study.