Suspicion of endometriosis (based on evaluation of symptoms, gynaecological examination and transvaginal ultrasonography) History of infertility Previous diagnosis of endometriosis Gynaecological, intestinal and urological diseases causing abdominal pain (e.g. pelvic congestion syndrome, bladder pain syndrome) Severe underlying comorbidities (cardiovascular, respiratory, renal, hematological, endocrine, hepatic, gastrointestinal, neurological, or psychiatric) Pregnancy at any gestational age Suspicion or diagnosis of oncological pathology Use of gonadotropin releasing hormone analogues (GnRH-a) Restless legs syndrome Shift work Use of antiallergic drugs Narcotics Refusal or inability to sign the informed consent form or complete the study questionnaires