Reliability of sleep spindle measurements in adolescents: How many nights are necessary?

Chelsea M. Reynolds, Michael Gradisar, Michelle A. Short

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Evidence of night-to-night variation in adolescent sleep spindle characteristics is lacking. Twelve adolescents (M = 15.8 ± 0.8 years, eight males) participated in a laboratory study involving 9 nights with 10 hr sleep opportunity. Sleep electroencephalograph was analysed and intra-class coefficients calculated to determine the reliability of sleep spindles across multiple nights of recording. Slow spindle amplitude and fast spindle density, duration and amplitude characteristics all had acceptable reliability within a single night of sleep recording. Slow spindle density and duration measurements needed a minimum of 4 and 2 nights, respectively, for reliable estimation. Theoretical and methodological implications are discussed.

Original languageEnglish
Article numbere12698
Number of pages5
JournalJournal of Sleep Research
Issue number1
Early online date2018
Publication statusPublished - 1 Feb 2019


  • adolescence
  • night-to-night variability
  • sleep EEG


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