title: Unresolved issues in sleep ontogeny: a response to Blumberg et al.
authors.affiliation: Department of Neuroscience, University of Pennsylvania School of Medicine, Philadelphia, PA 19104-6074, USA. mgf@mail.med.upenn.edu
authors.forename: Marcos G
authors.initials: MG
authors.lastname: Frank
authors.forename: H Craig
authors.initials: HC
authors.lastname: Heller
mesh_terms: D000818:Animals; D004569:Electroencephalography; D004576:Electromyography; D051381:Rats; D017207:Rats, Sprague-Dawley; D017208:Rats, Wistar; D012890:Sleep / Q000502:physiology*; D012894:Sleep Stages / Q000502:physiology