title: Polysomnography assessment of sleep and wakefulness in premature newborns.
abstract: OBJECTIVE
  to describe the total sleep time and its stages, total wake time, heart rate values and oxygen saturation shown by premature infants, and the influence of the periods of the day on sleep and physiological parameters.
  
  
  METHODS
  a descriptive study was conducted of 13 hospitalized premature infants. Data collection was performed using polysomnography and unstructured observation for 24 uninterrupted hours.
  
  
  RESULTS
  the newborns remained asleep for 59.6% of the day, predominantly in quiet sleep, with a higher mean heart rate during wakefulness (p<0.001). No difference was found between the variables related to sleep, physiological parameters and periods of the day, but in the morning a predominance of quiet sleep was observed (p=0.002).
  
  
  CONCLUSIONS
  the preterm newborn presented more total sleep time than wakefulness; quiet sleep was the predominant stage, and heart rate was higher during wakefulness.
authors.affiliation: Curso de Enfermagem, Escola Paulista de Enfermagem, Universidade Federal de São Paulo, São Paulo, SP, Brasil.
authors.forename: Nathalie Sales
authors.initials: NS
authors.lastname: Llaguno
authors.affiliation: Departamento de Enfermagem Pediátrica, Escola Paulista de Enfermagem, Universidade Federal de São Paulo, São Paulo, SP, Brasil.
authors.forename: Mavilde da Luz Gonçalves
authors.initials: Mda L
authors.lastname: Pedreira
authors.affiliation: Departamento de Enfermagem Pediátrica, Escola Paulista de Enfermagem, Universidade Federal de São Paulo, São Paulo, SP, Brasil.
authors.forename: Ariane Ferreira Machado
authors.initials: AF
authors.lastname: Avelar
authors.affiliation: Departamento de Enfermagem Pediátrica, Escola Paulista de Enfermagem, Universidade Federal de São Paulo, São Paulo, SP, Brasil.
authors.forename: Marta Jose
authors.initials: MJ
authors.lastname: Avena
authors.affiliation: Departamento de Bioestatística, Universidade Estadual Paulista Júlio de Mesquita Filho, Botucatu, SP, Brasil.
authors.forename: Miriam Harumi
authors.initials: MH
authors.lastname: Tsunemi
authors.affiliation: Departamento de Enfermagem Pediátrica, Escola Paulista de Enfermagem, Universidade Federal de São Paulo, São Paulo, SP, Brasil.
authors.forename: Eliana Moreira
authors.initials: EM
authors.lastname: Pinheiro
mesh_terms: D005260:Female; D006339:Heart Rate; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D008297:Male; D017286:Polysomnography; D012890:Sleep; D014851:Wakefulness