title: Sleep disorders in pregnancy.
abstract: BACKGROUND
  The precise function of sleep in animals and human beings is still unknown, and any sort of physical, social or psychological variation may change the normal sleep-wake cycle.
  
  
  OBJECTIVE
  This research aims is to determine the sleep disorders (SD) for each of the three trimesters of the pregnancy comparing them to the pre-pregnancy state (PG).
  
  
  METHODS
  SD were investigated in three hundred pregnant women 11- to 40-years-old through with a brief clinical interview based on directed questions. One hundred pregnant women were considered for each trimester.
  
  
  RESULTS
  The rate of pregnant women with insomnia increased by 23% in the 2nd trimester (p< 0.005); the rate for excessive daytime sleepiness (EDS) by 15% in the 1st trimester (p<0.003), 55% in the 2nd trimester (p<0.001) and by 14% in the 3rd trimester (p<0.002); the rate for mild sleepiness increased by 33% in the 2nd trimester (p<0.002) and by 48% in the 3rd trimester (p<0.001); the rate for specific awakenings increased by 63% in the 1st trimester, by 80% in the 2nd trimester and by 84% in the 3rd trimester (p<0.001).
  
  
  CONCLUSIONS
  SD were more frequent during pregnancy comparatively to PG state, mostly at the expenses of EDS and specific awakenings.
authors.affiliation: Sleep Disorders Center, Department of Neurology, Federal University of Sao Paulo, Sao Paulo, SP, Brazil.
authors.forename: Eliane Aversa
authors.initials: EA
authors.lastname: Lopes
authors.forename: Luciane Bizari Coin de
authors.initials: LB
authors.lastname: Carvalho
authors.forename: Priscila Bernal da Costa
authors.initials: PB
authors.lastname: Seguro
authors.forename: Rosiane
authors.initials: R
authors.lastname: Mattar
authors.forename: Ademir Baptista
authors.initials: AB
authors.lastname: Silva
authors.forename: Lucila B Fernandes do
authors.initials: LB
authors.lastname: Prado
authors.forename: Gilmar Fernandes do
authors.initials: GF
authors.lastname: Prado
mesh_terms: D000293:Adolescent; D000328:Adult; D001938:Brazil / Q000453:epidemiology; D002648:Child; D005260:Female; D006801:Humans; D007407:Interviews as Topic; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis / Q000453:epidemiology*; D011264:Pregnancy Trimesters; D015995:Prevalence; D007319:Sleep Initiation and Maintenance Disorders / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology; D012893:Sleep Wake Disorders / Q000175:diagnosis / Q000453:epidemiology* / Q000209:etiology