Nonrestorative sleep: a useful indicator of insomnia with a wide range of prevalence.

@article{Kawada2013NonrestorativeSA,
  title={Nonrestorative sleep: a useful indicator of insomnia with a wide range of prevalence.},
  author={Tomoyuki Kawada},
  journal={Sleep medicine},
  year={2013},
  volume={14 9},
  pages={925}
}
To the editor Zhang et al [1] reported a five-year follow-up study of middleaged individuals concerning the effect of nonrestorative sleep (NRS) on medical and mental outcomes. NRS frequently has been used in sleep studies, especially as a component of insomnia [2]. Although the frequency and the interval of observation are standardized for the prevalence of NRS, there appear to be ethnic differences in the prevalence of NRS, partly derived from the wording of the questionnaire item or the… CONTINUE READING
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