When is pain related to emotional distress and daily functioning in fibromyalgia syndrome? The mediating roles of self-efficacy and sleep quality.

Abstract

Fibromyalgia (FM) is a chronic pain syndrome associated with adverse symptoms of cognitive, behavioural, and emotional dysfunction. Accumulating evidence supports the notion that sleep dysfunction, which affects almost all FM patients, has a reciprocal influence on pain. Yet, little is known about the relationship between sleep and other FM symptoms. The present study analysed the role of sleep dysfunction as a mediator of the impact of pain intensity on anxiety, depression, and daily functioning, comparing them with the mediating role of self-efficacy.