title: The riddle of the sphinx: Sleep, pain, and depression.
authors.forename: Michael T
authors.initials: MT
authors.lastname: Smith
authors.forename: Phillip J
authors.initials: PJ
authors.lastname: Quartana
mesh_terms: D003865:Major Depressive Disorder / Q000503:physiopathology*; D006801:Humans; D010146:Pain / Q000503:physiopathology*; D012890:Sleep / Q000502:physiology*