According to the American Academy of Orofacial Pain (AAOP), temporomandibular disorders (TMD) are a set of pathological conditions characterised by pain or limitation of movement in the temporomandibular joint(s) (TMJ), the masticatory muscles or both. 1,2 The main functional, physical and psychosocial consequences of TMD may significantly impair oral health and quality of life. 2,3 It is a multifactorial condition triggered by initiating co-factors: existing pain conditions, trauma, parafunction or emotional distress, which affect the stomatognathic system's homeostasis. 4 The Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) was published in 1992 and has been the standard diagnostic tool for TMD until 2014, when the Diagnostic Criteria for Temporomandibular Disorders (DC/TMD) was published. 5,6 The TMD chronic pain is frequently related to other chronic pain conditions (ie tension headaches, fibromyalgia, chronic fatigue and irritable bowel syndrome) and present neuroendocrine abnormalities, biopsychosocial distress, fatigue, impaired sleep quality, anxiety and/or depression. 7 Sleep quality and TMD relationship have been studied since 1995. 6 It was found that mandibular pain was twice as high in

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