title: Response to Fetveit and Bjorvatn's Letter to the Editor.
authors.forename: Sonia
authors.initials: S
authors.lastname: Ancoli-Israel
authors.forename: Cathy
authors.initials: C
authors.lastname: Alessi
mesh_terms: D003704:Dementia / Q000150:complications*; D006801:Humans; D010789:Phototherapy; D012893:Sleep Wake Disorders / Q000209:etiology / Q000517:prevention & control*