Sleep and Biological Rhythms

, Volume 17, Issue 2, pp 263–264 | Cite as

“Time to relax”: considerations on relaxation training for insomnia disorder

  • Daniel Ruivo MarquesEmail author
Letter to the Editor



The author would like to express his gratitude to Dr. Ana Allen Gomes and Dr. Vanda Clemente for their helpful comments.

Compliance with ethical standards

Conflict of interest

The authors report no conflicts of interest.


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Copyright information

© Japanese Society of Sleep Research 2019

Authors and Affiliations

  1. 1.Department of Education and PsychologyUniversity of AveiroAveiroPortugal
  2. 2.Faculty of Psychology and Educational Sciences, CINEICC - Center for Research in Neuropsychology and Cognitive Behavioral InterventionUniversity of CoimbraCoimbraPortugal

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