title: Infant attachment and toddlers' sleep assessed by maternal reports and actigraphy: different measurement methods yield different relations.
abstract: OBJECTIVE
  To investigate relations between children's attachment and sleep, using objective and subjective sleep measures. Secondarily, to identify the most accurate actigraphy algorithm for toddlers.
  
  
  METHODS
  55 mother-child dyads took part in the Strange Situation Procedure (18 months) to assess attachment. At 2 years, children wore an Actiwatch for a 72-hr period, and their mothers completed a sleep diary.
  
  
  RESULTS
  The high sensitivity (80) and smoothed actigraphy algorithms provided the most plausible sleep data. Maternal diaries yielded longer estimated sleep duration and shorter wake duration at night and showed poor agreement with actigraphy. More resistant attachment behavior was not associated with actigraphy-assessed sleep, but was associated with longer nocturnal wake duration as estimated by mothers, and with a reduced actigraphy-diary discrepancy.
  
  
  CONCLUSIONS
  Mothers of children with resistant attachment are more aware of their child's nocturnal awakenings. Researchers and clinicians should select the best sleep measurement method for their specific needs.
authors: Department of Psychology, Université de Sherbrooke (campus Longueuil), 150 place Charles-Le Moyne, Bureau 200, Longueuil, QC, Canada, J4K 0A8. valerie.simard@usherbrooke.ca
authors: Valérie
authors: V
authors: Simard
authors: Annie
authors: A
authors: Bernier
authors: Marie-Ève
authors: MÈ
authors: Bélanger
authors: Julie
authors: J
authors: Carrier
mesh_terms: D056044:Actigraphy / Q000379:methods*; D002170:Canada; D002652:Child Behavior / Q000502:physiology / Q000523:psychology*; D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D018730:Infant Behavior / Q000502:physiology / Q000523:psychology; D008137:Longitudinal Studies; D008297:Male; D009034:Mother-Child Relations / Q000523:psychology*; D009035:Mothers; D009769:Object Attachment; D015203:Reproducibility of Results; D012890:Sleep / Q000502:physiology*; D011795:Surveys and Questionnaires; D013997:Time Factors; D014505:Urban Population / Q000706:statistics & numerical data
keywords: actigraphy; attachment; child; preschool; sleep