Two such genes have been independently identified, that I know of. There has been more than one study. Here's a piece from 2015; http://www.bbc.com/future/stor

Two such genes have been independently identified, that I know of. There has been more than one study. Here's a piece from 2015; http://www.bbc.com/future/story/20150706-the-woman-who-barely-sleeps http://www.bbc.com/future/story/20150706-the-woman-who-barel... , which discusses this from 2009 - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2884988/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2884988/ A search for studies on DEC2 suggests a steady stream of work going on; https://www.ncbi.nlm.nih.gov/pmc/?term=DEC2 https://www.ncbi.nlm.nih.gov/pmc/?term=DEC2 Here's more recent research identifying another gene; https://www.news-medical.net/news/20190828/UC-San-Francisco-scientists-identify-second-short-sleep-gene-after-10-year-search.aspx https://www.news-medical.net/news/20190828/UC-San-Francisco-... There has been more than one study, more than one family and more than one gene implicated.