Researchers Identify a Genetic Factor that Regulates How Long We Sleep

http://www.sleepfoundation.org/alert/researchers-identify-genetic-factor-regulates-how-long-we-sleep  

An international team of researchers led by LMU Munich chronobiologists Professor Till Roenneberg and Dr. Karla Allebrandt has now identified the first genetic variant that has a significant effect on sleep duration and is found frequently in the general population. The variant was discovered in the course of a so-called genome-wide association study, in which the researchers scanned individual genomes for variations that were correlated with sleep patterns.