Behavioral Sleep Medicine (2015) - Comment
pubmed: 24925081  doi: 10.1080/15402002.2014.919918  issn: 1540-2010  issn: 1540-2002 

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Wolfram Regen, Elisabeth Hertenstein, Peter Weil, Simon D. Kyle, Johannes Holz, Chiara Baglioni, Christoph Nissen, Bernd Feige, Dieter Riemann, Kai Spiegelhalder