“…Sleep disturbances are another aspect of chronic pain, which are not unique to the fibromyalgia syndrome (where they are a major defining feature) but also encountered in osteoarthritis [51], rheumatoid arthritis [52], and other rheumatological populations. In osteoarthritis, sleep disorders have been shown to be linked to pain, depressive mode, and disability [53], and treating sleep disturbances with non-pharmacological measures such as cognitive behavioral therapy (CBT) has been shown to be effective in the management of pain [54].…”