Genotypic influences on individual variability in sleep duration. (a) Night and day sleep duration for every fly in the experiment, segregated by genotype and ordered from shortest-sleeping to longest-sleeping line. Male flies are represented by blue dots; females are represented by pink dots. Gray horizontal bars show the range of sleep duration in each line. (b) and (c) Plot of sleep duration line mean versus sleep duration CVE. (b) Night sleep. (c) Day sleep.
Harbison et al. BMC Genomics 2013 14:281 doi:10.1186/1471-2164-14-281