Barton, R. A., & Capellini, I. (2016). Sleep, evolution and brains : Commentary on Herculano-Houzel S (2015): Decreasing sleep requirement with increasing numbers of neurons as a driver for bigger brains and bodies in mammalian evolution. Proc Biol Sci 282:20151853. Brain, behavior and evolution, 87(2), 65-68. https://doi.org/10.1159/000443716