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I øjeblikket omkring man falder i søvn kan der forekomme små ryk i kroppen kaldet [[søvnryk]].
 
Der er fundet mindst 500 historiske tekster af Roger Ekirch på, at mennesker før den [[industrielle revolution]], har sovet af to omgange; fra skumring til et tidspunkt i natten og brugte så tiden til at bede til gud, ryge eller sex. Og er herefter gået i seng igen og stået op ved morgengry.<ref>[http://www.bbc.co.uk/news/magazine-16964783 22 February 2012, bbc.co.uk: The myth of the eight-hour sleep] Citat: "..."It's not just the number of references - it is the way they refer to it, as if it was common knowledge," Ekirch says...By the 1920s the idea of a first and second sleep had receded entirely from our social consciousness..."</ref><ref>[http://aeon.co/magazine/psychology/why-broken-sleep-is-a-golden-time-for-creativity/ 7 November 2014, aeon.co: Broken sleep by Karen Emslie] Citat: "...Then, in the late 19th century, everything changed. The lights got turned on...In Daily Rituals: How Artists Work (2013), Mason Currey describes the routines of famous writers and artists, many of whom are early risers, and several segmented sleepers. Currey found that many hit on the pattern of segmented sleep by accident...""</ref><ref>[http://www.history.vt.edu/Ekirch/sleepcommentary.html history.vt.edu, A. Roger Ekirch: "Sleep We Have Lost" Commentary]</ref><ref>[http://jyllands-posten.dk/livsstil/familiesundhed/sundhed/ECE8103436/F%C3%B8rhen-plejede-man-at-st%C3%A5-op-om-natten-for-at-ryge-bede-til-gud-eller-dyrke-sex/ 10.10.2015, jyllands-posten.dk: Førhen plejede man at stå op om natten for at ryge, bede til gud eller dyrke sex]</ref><ref>[[:en:Segmented sleep]]</ref>
 
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