title: The diurnal variation in perception of pain.
mesh_terms: D000704:Analysis of Variance; D002940:Circadian Rhythm; D002986:Clinical Trials as Topic; D005260:Female; D006801:Humans; D008297:Male; D010148:Intractable Pain / Q000188:drug therapy / Q000209:etiology / Q000503:physiopathology*; D010551:Personality; D012737:Sex Factors; D014851:Wakefulness; D014937:Work