多相睡眠
info Retrieved on 2009-07-25
↑ Brown, Walter A., MD (2006-05-26). “Acknowledging Preindustrial Patterns of Sleep May Revolutionize Approach to Sleep Dysfunction”. Applied Neurology (CMPMedica). http://appneurology.com/showArticle.jhtml?articleId=188500785 2008年2月3日閲覧. "The discoveries of Ekirch and Wehr raise the possibility that segmented sleep is "normal" and, as such, these revelations hold significant implications for both understanding sleep and the treatment of insomnia."
Warren, Jeff (2007). “The Watch”. The Head Trip: Adventures on the Wheel of Consciousness. Toronto: Random House Canada. ISBN 978-0679314080
Jean Verdon, Night in the Middle Ages, trans. George Holoch (2002). ISBN 026803656X.