Fibromyalgia has been referred to as one of the most common rheumatological pathologies in the world´s population, coming in fourth place in Spain and Bangaldesh, second in the USA, Brasil and Mexico (Assumpção, 2006). Regarding the recovery cases of people who sought help at Clínica da Mente, prior to this study, with complaints regarding emotional issues and who had Fibromyalgia, this study aims to investigate to which extent the perception of quality of sleep affects the perception of pain in patients with fibromyalgia. The results point to a significant correlation between quality of sleep and perception of pain (ρ=0,994 para p≤0,01). It was also demonstrated that emotional states such as depression, anxiety and stress disturb the perception of quality of sleep. As such, emotional states condition sleep, which in turn conditions the perception of pain in patients with fibromyalgia.
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