title: Time of day versus internal circadian timing references.
authors.affiliation: Department of Laboratory Medicine, University of Minnesota, Minneapolis 55455, USA.
authors.forename: R B
authors.initials: RB
authors.lastname: Sothern
mesh_terms: D000818:Animals; D002940:Circadian Rhythm; D004334:Drug Administration Schedule; D006801:Humans; D051379:Mice; D051381:Rats; D012890:Sleep / Q000502:physiology; D013997:Time Factors; D014851:Wakefulness / Q000502:physiology