661665 «Napping,» University of Texas at Austin University Health Services, healthyhorns.utexas.edu.
662666 Nikolas Markantonatos, «Holy Cross Senior Brings Sleep Education Program to Worcester,» College of the Holy Cross, March 1, 2011, https://news.holycross.edu.
663667 «Simply Profound,» Sweet Dreamzzz, http://www.sweetdreamzzz.org; «Sweet Dreamzzz at a Glance,» Sweet Dreamzzz, http://www.sweetdreamzzz.org.
665669 Jon Methven, «Why We Sleep Together,» The Atlantic, June 11, 2014, http://www.theatlantic.com.
666670 Ibid.
667671 Ibid.
668673 John Dittami, Marietta Keckeis, Ivo Machatschke, Stanislav Katina, Josef Zeitlhofer, and Gerhard Kloesch, «Sex Differences in the Reactions to Sleeping in Pairs Versus Sleeping Alone in Humans,» Sleep and Biological Rhythms 5 (2007): 271–76.
669674 Methven, «Why We Sleep Together.»
670675 Alexandra Sifferlin, «What Your Sleeping Position Says About Your Relationship,» TIME, April 16, 2014, http://www.time.com.
671676 Richard Wiseman's Night School, presented by Richard Wiseman (Edinburgh: Edinburgh International Science Festival, 2014), http://www.youtube.com.
672677 Elizabeth Bernstein, «Couples on Different Sleep Schedules Can Expect Conflict – and Adapt,» The Wall Street Journal, September 9, 2014, http://www.wsj.com.
673678 Brant P. Hasler and Wendy M. Troxel, «Couples' Nighttime Sleep Efficiency and Concordance: Evidence for Bidirectional Associations with Daytime Relationship Functioning,» Psychosomatic Medicine 72 (2010): 794–801.