During the telephone interview, participants will be asked question about their sleep and pain history. Participants with poor sleep will visit the University of Florida for a medical history and will be connected to a machine which will monitor their sleep. Participants will return home to sleep while still connected to the machine and will return the machine to the University of Florida the next day. A third visit will consist of completing questionnaires and measuring response to a range of temperatures. Participants will complete brief daily questionnaires and wear an actigraph (wristwatch-like device) that measures arm movements for two weeks.