title: Relationships Among Daytime Napping and Fatigue, Sleep Quality, and Quality of Life in Cancer Patients.
abstract: BACKGROUND
  The relationships among napping and sleep quality, fatigue, and quality of life (QOL) in cancer patients are not clearly understood.
  
  
  OBJECTIVE
  The aim of the study was to determine whether daytime napping is associated with nighttime sleep, fatigue, and QOL in cancer patients.
  
  
  METHODS
  In total, 187 cancer patients were recruited. Daytime napping, nighttime self-reported sleep, fatigue, and QOL were assessed using a questionnaire. Objective sleep parameters were collected using a wrist actigraph.
  
  
  RESULTS
  According to waking-after-sleep-onset measurements, patients who napped during the day experienced poorer nighttime sleep than did patients who did not (t = -2.44, P = .02). Daytime napping duration was significantly negatively correlated with QOL. Patients who napped after 4 PM had poorer sleep quality (t = -1.93, P = .05) and a poorer Short-Form Health Survey mental component score (t = 2.06, P = .04) than did patients who did not. Fatigue, daytime napping duration, and sleep quality were significant predictors of the mental component score and physical component score, accounting for 45.7% and 39.3% of the variance, respectively.
  
  
  CONCLUSIONS
  Daytime napping duration was negatively associated with QOL. Napping should be avoided after 4 PM.
  
  
  CONCLUSIONS
  Daytime napping affects the QOL of cancer patients. Future research can determine the role of napping in the sleep hygiene of cancer patients.
authors.affiliation: Author Affiliations: Department of Nursing, Yuanpei University of Medical Technology, Hsinchu (Dr Sun); and School of Nursing, College of Nursing, Taipei Medical University, Taipei (Dr Lin), Taiwan.
authors.forename: Jia-Ling
authors.initials: JL
authors.lastname: Sun
authors.forename: Chia-Chin
authors.initials: CC
authors.lastname: Lin
mesh_terms: D000328:Adult; D000368:Aged; D003430:Cross-Sectional Studies; D005221:Fatigue / Q000150:complications / Q000523:psychology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009369:Neoplasms / Q000150:complications* / Q000523:psychology; D011788:Quality of Life / Q000523:psychology*; D057566:Self Report; D012890:Sleep; D011795:Surveys and Questionnaires; D013997:Time Factors